P2571 Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic

P2571 stands for an unsteady or intermittently lost signal from the temperature sensor of a direct ozone reduction (DOR) catalyst. Unlike P2569 and P2570, which describe a lasting low or high fault, this code covers readings that jump around or vanish for moments. No manufacturer publicly documents P2571; the VW specification books that use this sensor family list only P2568 to P2570. On the VW 2.0 L TSI the part is the radiator identification sensor G611, which a VW Tech Tip says is bonded to the radiator, so a sensor that has come loose or a corroded plug is a plausible cause. CARB requires DOR systems to be monitored, and BASF's PremAir coating is the best-known DOR catalyst. Driving is unaffected.

Likely causes

Symptoms

• Check engine light that may come and go
• No noticeable effect on driving or cooling

Repair estimate

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

Parts involved

Related codes

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