OPINION
LANKFORD, Judge.
¶ 1 Defendant Jeffrey Arthur Gastelum appeals from his convictions and sentences for unlawful flight from a law enforcement vehicle, a class five felony, possession of precursor chemicals, a class five felony, and possession of dangerous drugs for sale, a class two felony. The issue is: Did the superior court properly enhance Defendant’s sentence based on two prior felony convictions? For the reasons that follow, we affirm Defendant’s convictions, vacate his sentences and remand for resentencing.
¶ 2 We review the facts in the light most favorable to upholding the verdict, resolving all reasonable inferences against the defendant. State v. Greene, 192 Ariz. 431, 436, ¶ 12, 967 P.2d 106, 111 (1998). A police officer observed Defendant placing two or three bags in the back of a vehicle. Defendant entered the driver’s side of the vehicle and drove away with another man in the passenger’s seat. The officer noticed that the vehicle’s registration had expired. He then activated the emergency lights of his police vehicle.
¶ 3 Defendant initially slowed, but then continued. The police officer activated the [274]*274sirens. Defendant accelerated rapidly. To avoid a high-speed chase in a residential area, the police officer turned off the siren and emergency lights and followed the vehicle from a distance.
¶4 Shortly thereafter, the police officer discovered that the car had left the road and had collided with a parked vehicle in the driveway of a residence. Both Defendant and the passenger exited the car and attempted to flee. The officer arrested Defendant and searched him. In Defendant’s pockets, the officer discovered four blister packs, each filled with 24 pills of pseudoephedrine, 30 milligrams.1
¶ 5 Defendant’s vehicle contained three bags, two of which the officer had seen Defendant place inside the vehicle. In one of the bags, the officer found a shaving cream container with a false bottom holding 17.3 grams of a substance containing methamphetamine. The same bag also contained several blister packs of pseudoephedrine, an electronic scale, glass pipes, tubing, and other drug paraphernalia. In another bag, the officer located a semiautomatic pistol.
¶ 6 The State charged Defendant with unlawful flight from a law enforcement vehicle, possession of precursor chemicals, possession of dangerous drugs for sale, and misconduct involving weapons. The jury found Defendant guilty of unlawful flight from a law enforcement vehicle, possession of precursor chemicals, and possession of dangerous drugs for sale, and not guilty of misconduct involving weapons.
¶ 7 Defendant and the State orally stipulated that Defendant had two prior felony convictions: a 2001 conviction for attempt to commit theft of a means of transportation and a 1991 conviction for trafficking in stolen property. The court did not personally address the Defendant, and did not advise him of the potential effect of admitting the two prior convictions, the right to deny or admit them, or the right to a trial on the prior convictions.2
¶ 8 At the sentencing hearing, the court referred to the stipulation. In doing so, the court mentioned the 2001 conviction, but omitted the 1991 conviction. Instead, the court referred to a 2003 conviction for possession of marijuana. Defense counsel concurred with the court’s mistaken account of the stipulation. The court sentenced Defendant to the presumptive terms with two historical felony convictions for unlawful flight from a law enforcement vehicle, possession of precursor chemicals, and possession of dangerous drugs for sale, all terms to run concurrently.
¶ 9 Defendant timely appealed. We have jurisdiction pursuant to the Arizona Constitution, Article 6, Section 9, and Arizona Revised Statutes (“A.R.S.”) sections 12-120.21(A)(1) (2003), 13-4031 (2001), and 13-4033(A) (2001).3 We review de novo the [275]*275superior court’s acceptance of a defendant’s admission of a prior conviction. Anderson, 199 Ariz. at 194, ¶ 35, 16 P.3d at 221.
¶ 10 The court mistakenly relied in sentencing on a conviction neither proved nor part of the stipulation. The parties had stipulated to a 1991 conviction for trafficking in stolen property and a 2001 conviction for attempt to commit theft of a means of transportation. When the court recited the stipulation at sentencing, it mentioned the 2001 conviction, but omitted the 1991 conviction. Instead, the court referred to a 2003 conviction for possession of marijuana not part of the parties’ stipulation.4
¶ 11 The court’s error prejudiced Defendant. A finding of two or more prior felony convictions was required for the enhanced sentences imposed. See A.R.S. § 13-604(C), (D) (Supp.2005). One of the two prior convictions the court used for enhancement was unproved.5 Our supreme court held in State v. Henderson that imposing a super-aggravated sentence that requires a finding of two aggravating factors without properly finding both of them constituted prejudicial fundamental error. 210 Ariz. 561, 570, ¶34, 115 P.3d 601, 610 (2005). The same is true for an enhanced sentence that requires two prior convictions. If both are not found, the sentence must be reversed. Therefore, Defendant’s sentences must be vacated.
¶ 12 The court committed additional procedural errors in sentencing. Rule 17 of the Arizona Rules of Criminal Procedure establishes requirements for admitting a pri- or conviction. “Whenever a prior conviction is charged, an admission thereto by the defendant shall be accepted only under the procedures of [Rule 17], unless admitted by the defendant while testifying on the stand.” Ariz. R.Crim. P. 17.6. An admission of a prior conviction requires that the court “advise the defendant of the nature of the allegation, the effect of admitting the allegation on the defendant’s sentence, and the defendant’s right to proceed to trial and require the State to prove the allegation.” Anderson, 199 Ariz. at 194, ¶ 36, 16 P.3d at 221. See Ariz. R.Crim. P. 17.2. It also requires that the court determine whether the defendant wants to forego his constitutional rights and whether the admission is voluntary. See State v. Alvarado, 121 Ariz. 485, 489, 591 P.2d 973, 977 (1979); Ariz. R.Crim. P. 17.3.
¶ 13 The State does not challenge the applicability of Rule 17.6 to this case. Any argument to the contrary has been waived. However, the superior court’s minute entry on remand clarifies that it acted on the assumption that Rule 17 procedures did not apply because Defendant’s enhanced sentence rested on a stipulation by the parties, rather than on an admission by Defendant. The court cites no authority for the proposition that a stipulation is not subject to Rule 17. To prevent recurring error, we address the issue notwithstanding the waiver.
¶ 14 A defendant may not stipulate to a prior conviction without the protections of Rule 17.6. The rule provides: ‘Whenever a [276]
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OPINION
LANKFORD, Judge.
¶ 1 Defendant Jeffrey Arthur Gastelum appeals from his convictions and sentences for unlawful flight from a law enforcement vehicle, a class five felony, possession of precursor chemicals, a class five felony, and possession of dangerous drugs for sale, a class two felony. The issue is: Did the superior court properly enhance Defendant’s sentence based on two prior felony convictions? For the reasons that follow, we affirm Defendant’s convictions, vacate his sentences and remand for resentencing.
¶ 2 We review the facts in the light most favorable to upholding the verdict, resolving all reasonable inferences against the defendant. State v. Greene, 192 Ariz. 431, 436, ¶ 12, 967 P.2d 106, 111 (1998). A police officer observed Defendant placing two or three bags in the back of a vehicle. Defendant entered the driver’s side of the vehicle and drove away with another man in the passenger’s seat. The officer noticed that the vehicle’s registration had expired. He then activated the emergency lights of his police vehicle.
¶ 3 Defendant initially slowed, but then continued. The police officer activated the [274]*274sirens. Defendant accelerated rapidly. To avoid a high-speed chase in a residential area, the police officer turned off the siren and emergency lights and followed the vehicle from a distance.
¶4 Shortly thereafter, the police officer discovered that the car had left the road and had collided with a parked vehicle in the driveway of a residence. Both Defendant and the passenger exited the car and attempted to flee. The officer arrested Defendant and searched him. In Defendant’s pockets, the officer discovered four blister packs, each filled with 24 pills of pseudoephedrine, 30 milligrams.1
¶ 5 Defendant’s vehicle contained three bags, two of which the officer had seen Defendant place inside the vehicle. In one of the bags, the officer found a shaving cream container with a false bottom holding 17.3 grams of a substance containing methamphetamine. The same bag also contained several blister packs of pseudoephedrine, an electronic scale, glass pipes, tubing, and other drug paraphernalia. In another bag, the officer located a semiautomatic pistol.
¶ 6 The State charged Defendant with unlawful flight from a law enforcement vehicle, possession of precursor chemicals, possession of dangerous drugs for sale, and misconduct involving weapons. The jury found Defendant guilty of unlawful flight from a law enforcement vehicle, possession of precursor chemicals, and possession of dangerous drugs for sale, and not guilty of misconduct involving weapons.
¶ 7 Defendant and the State orally stipulated that Defendant had two prior felony convictions: a 2001 conviction for attempt to commit theft of a means of transportation and a 1991 conviction for trafficking in stolen property. The court did not personally address the Defendant, and did not advise him of the potential effect of admitting the two prior convictions, the right to deny or admit them, or the right to a trial on the prior convictions.2
¶ 8 At the sentencing hearing, the court referred to the stipulation. In doing so, the court mentioned the 2001 conviction, but omitted the 1991 conviction. Instead, the court referred to a 2003 conviction for possession of marijuana. Defense counsel concurred with the court’s mistaken account of the stipulation. The court sentenced Defendant to the presumptive terms with two historical felony convictions for unlawful flight from a law enforcement vehicle, possession of precursor chemicals, and possession of dangerous drugs for sale, all terms to run concurrently.
¶ 9 Defendant timely appealed. We have jurisdiction pursuant to the Arizona Constitution, Article 6, Section 9, and Arizona Revised Statutes (“A.R.S.”) sections 12-120.21(A)(1) (2003), 13-4031 (2001), and 13-4033(A) (2001).3 We review de novo the [275]*275superior court’s acceptance of a defendant’s admission of a prior conviction. Anderson, 199 Ariz. at 194, ¶ 35, 16 P.3d at 221.
¶ 10 The court mistakenly relied in sentencing on a conviction neither proved nor part of the stipulation. The parties had stipulated to a 1991 conviction for trafficking in stolen property and a 2001 conviction for attempt to commit theft of a means of transportation. When the court recited the stipulation at sentencing, it mentioned the 2001 conviction, but omitted the 1991 conviction. Instead, the court referred to a 2003 conviction for possession of marijuana not part of the parties’ stipulation.4
¶ 11 The court’s error prejudiced Defendant. A finding of two or more prior felony convictions was required for the enhanced sentences imposed. See A.R.S. § 13-604(C), (D) (Supp.2005). One of the two prior convictions the court used for enhancement was unproved.5 Our supreme court held in State v. Henderson that imposing a super-aggravated sentence that requires a finding of two aggravating factors without properly finding both of them constituted prejudicial fundamental error. 210 Ariz. 561, 570, ¶34, 115 P.3d 601, 610 (2005). The same is true for an enhanced sentence that requires two prior convictions. If both are not found, the sentence must be reversed. Therefore, Defendant’s sentences must be vacated.
¶ 12 The court committed additional procedural errors in sentencing. Rule 17 of the Arizona Rules of Criminal Procedure establishes requirements for admitting a pri- or conviction. “Whenever a prior conviction is charged, an admission thereto by the defendant shall be accepted only under the procedures of [Rule 17], unless admitted by the defendant while testifying on the stand.” Ariz. R.Crim. P. 17.6. An admission of a prior conviction requires that the court “advise the defendant of the nature of the allegation, the effect of admitting the allegation on the defendant’s sentence, and the defendant’s right to proceed to trial and require the State to prove the allegation.” Anderson, 199 Ariz. at 194, ¶ 36, 16 P.3d at 221. See Ariz. R.Crim. P. 17.2. It also requires that the court determine whether the defendant wants to forego his constitutional rights and whether the admission is voluntary. See State v. Alvarado, 121 Ariz. 485, 489, 591 P.2d 973, 977 (1979); Ariz. R.Crim. P. 17.3.
¶ 13 The State does not challenge the applicability of Rule 17.6 to this case. Any argument to the contrary has been waived. However, the superior court’s minute entry on remand clarifies that it acted on the assumption that Rule 17 procedures did not apply because Defendant’s enhanced sentence rested on a stipulation by the parties, rather than on an admission by Defendant. The court cites no authority for the proposition that a stipulation is not subject to Rule 17. To prevent recurring error, we address the issue notwithstanding the waiver.
¶ 14 A defendant may not stipulate to a prior conviction without the protections of Rule 17.6. The rule provides: ‘Whenever a [276]*276prior conviction is charged, an admission thereto by the defendant shall be accepted only under the procedures of this rule____” Ariz. R.Crim. P. 17.6. Defendant’s prior convictions were charged by the State, as they must be charged to invoke enhanced sentencing for repeat offenders. See A.R.S. § 13 — 604(P) (a prior felony conviction to be used to enhance sentence as a repetitive offender must be “charged in the indictment or information and admitted or found by the court”); State v. Rodgers, 134 Ariz. 296, 305-06, 655 P.2d 1348, 1357-58 (App.1982) (State must allege before trial prior convictions for sentencing enhancement). See also, e.g., Alvarado, 121 Ariz. at 489, 591 P.2d at 977 (“[Ujnless the defendant admits to his prior conviction while testifying on the stand, the trial court must follow the procedures of rule 17 before accepting the defendant’s admission.”).6
¶ 15 A stipulation to the existence of prior convictions is the equivalent of an admission that they exist. An admission is “[a] voluntary acknowledgement made by a party of the existence of the truth of certain facts which are inconsistent with his claims in an action.” Black’s Law Dictionary 47 (6th ed.1990). A stipulation is “[a]n agreement, admission or confession made in a judicial proceeding by the parties thereto or their attorneys.” Id. at 1415 (emphasis added). Accord Rutledge v. Ariz. Bd. of Regents, 147 Ariz. 534, 549, 711 P.2d 1207, 1222 (App.1985) (“A stipulation is an agreement, admission or concession made in a judicial proceeding by the parties or their attorneys, in respect to some matter incident to the proceedings, ordinarily for the purpose of avoiding delay, trouble and expense.”) (emphasis added). See also Wolf Corp. v. Louis, 11 Ariz.App. 352, 355, 464 P.2d 672, 675 (1970) (“A stipulation is a judicial admission constituting an abandonment of any contention to the contrary____”).
¶ 16 The most meaningful difference between the two is that an admission is made by a party, while a stipulation can be made by the parties or their attorneys.7 We can conceive of no reason why a defendant’s rights should be lessened by the fact that the concession is made by his counsel rather than by defendant himself. A stipulation has the same effect as an admission: It waives the right to a trial, which is the concern that led to the requirement of a determination of the voluntariness of an admission of prior convictions. See generally Boykin v. Alabama, 395 U.S. 238, 242, 89 S.Ct. 1709, 23 L.Ed.2d 274 (1969) (a guilty plea waives constitutional trial rights and therefore it must be shown affirmatively that the plea was intelligent and voluntary).
¶ 17 Rule 17 must be obeyed whenever a prior conviction is used for sentence enhancement and its existence rests on a non-testimonial concession by defendant or his counsel. If the procedures under the rule could be avoided merely by having defendants “stipulate” to the prior conviction rather than “admit” it, Rule 17.6 would be eviscerated by permitting all admissions to be made as “stipulations.”8
[277]*277¶ 18 The court failed to comply with Rule 17. Defense counsel stated that Defendant stipulated to the prior convictions and the court accepted this stipulation. The court had no interaction with Defendant. Defendant was not informed of the trial rights he would waive by admitting the prior convictions or of the specific consequences on his sentence of admitting a prior felony. See Medrano-Barraza, 190 Ariz. at 474, 949 P.2d at 563 (failure by court to inform defendant of his rights before acceptance of admission to prior convictions may render admission defective under Rule 17); Anderson, 199 Ariz. at 194, ¶ 36, 16 P.3d at 221 (“[B]efore accepting a defendant’s admission to a prior conviction, a trial court must advise the defendant of the nature of the allegation, the effect of admitting the allegation on the defendant’s sentence, and the defendant’s right to proceed to trial and require the State to prove the allegation.”).
¶ 19 The court’s failure to comply with Rule 17 resulted in additional prejudice to Defendant. It means that neither of the two prior convictions used for sentence enhancement were properly established, constituting prejudicial fundamental error. See Henderson, 210 Ariz. at 570, ¶ 34, 115 P.3d at 610. The dissent simply asserts that Defendant had not merely two, but four prior convictions. Defendant may well have multiple priors, but that has not yet been established and must be proved on resentencing.
¶20 Not a single prior conviction was proved. The stipulation of two convictions was invalid, as discussed above. Although Defendant’s presentence report indicates that he might have additional felony convictions, the court relied upon only one in enhancing Defendant’s sentence. Moreover, the presentence report was not in evidence. In the absence of evidence, subject to the usual rules of admissibility and the usual methods of contesting it, we cannot simply declare that Defendant has any prior convictions.
¶ 21 The State argues that any error was technical because Defendant had “sufficient experience with the criminal justice system to have been fully aware of what he was doing when he stipulated to the prior convictions----” Accordingly, the State contends that we need not remand for an evidentiary hearing.
¶22 Because we vacate the sentence on other grounds, the court will resentence Defendant. The prior convictions can be proved or, after the court advises Defendant as required by Rule 17, the Defendant can admit them.9
¶23 Accordingly, we affirm the convictions, vacate the sentences, and remand for resentencing.
LAWRENCE F. WINTHROP, P.J., concur.