Powertrain, generic (extended)

P2575 Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2575 reports a deterioration-sensor signal above the valid range on a direct ozone reduction (DOR) catalyst - typical for an open circuit, a missing ground or a short to a supply voltage. No vehicle maker has published how it uses P2575, and no service bulletin naming it turned up in the NHTSA index. As an analogy, VW's 2014 CC book sends an open LIN line or a short to battery from the DOR radiator sensor to P2570. Because the DOR coating sits on the radiator, a radiator swap is the most likely moment for a connector to be left off or a wire to be damaged. P2574 covers the low side, P2576 brief dropouts. The engine runs normally; only emissions monitoring is affected.

Likely causes

Connector left off or damaged during radiator work
Broken signal or ground wire
Signal wire shorted to a supply voltage

Symptoms

  • Check engine light on
  • No change in power or engine temperature

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–900
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dor deterioration sensorsensor wiring

Related codes

P2572P2573P2574P2576

References: law.cornell.edu, static.nhtsa.gov.