P2572Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2572 points to a general fault in the circuit of a sensor meant to judge how much ozone-converting activity is left on a direct ozone reduction (DOR) catalyst, such as a coated radiator. CARB demands a real deterioration check only when the DOR credit is above 5 mg/mi NMOG on LEV III/IV vehicles (or half the NMOG standard on older ones); at or below that, the system merely has to notice a total loss of ozone reduction. BASF rates its PremAir NXT coating at a 5 mg/mi credit, which helps explain why no maker publicly documents P2572 or a dedicated deterioration sensor. Low, high and erratic signals have their own codes (P2574-P2576), the plausibility check is P2573. Driving is not affected.
- What you may notice
- Check engine light on
- No effect on engine power or cooling
- Likely causes
- LikelyDamaged wiring or connector at the DOR sensor
- PossibleFailed deterioration sensor
- RareReplacement radiator without the sensor fitted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.