P2576Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2576 describes a deterioration-sensor signal on a direct ozone reduction (DOR) catalyst that comes and goes or jumps without a physical reason, rather than staying low (P2574) or high (P2575). Loose terminals, a cracked connector housing in the airstream ahead of the engine, or chafing where the harness meets the radiator are typical suspects, since that spot sees vibration, spray water and road salt. No manufacturer documents P2576 publicly. CARB's DOR rules describe what such a sensor would watch, and BASF positions its PremAir NXT radiator coating for the 150,000-mile durability that Tier 3 and LEV III demand. A stored code does not affect cooling or performance but counts as an emissions fault.
- What you may notice
- Check engine light, possibly only now and then
- No noticeable driving symptoms
- Likely causes
- LikelyLoose or corroded terminal in the sensor connector
- PossibleHarness chafing at the radiator support
- RareCracked connector housing letting water in
- 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: €30 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.