P2573Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2573 means the deterioration sensor watching a DOR (direct ozone reduction) catalyst delivers a signal that is electrically within limits but does not fit the expected behaviour, for example a value that never changes with conditions or contradicts other inputs. Such a sensor would estimate how much of the catalytic coating on the radiator still destroys ozone, which CARB requires on vehicles claiming a large DOR credit. No manufacturer publishes P2573 or its test criteria, so the exact check is unknown; on comparable VW systems the analogous plausibility code P2568 fires on a failed identity or function check of the radiator sensor. P2572 is the generic circuit fault, P2574/P2575 the low and high signals. Driveability is unchanged; the MIL may come on.
- What you may notice
- Check engine light after several drive cycles
- No change in how the car drives
- Likely causes
- PossibleDeterioration sensor drifting or stuck at one value
- PossibleNon-original radiator with a sensor that does not match
- RareRadiator face heavily fouled, skewing the sensor reading
- 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: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.