VOLVO
ECM-231D - Rear heated oxygen sensor (HO2S) aging, bank 2. Signal too low
Układ
Sterownik silnika (ECM)
Modele Volvo, których dotyczy ten kod błędu
Dotyczy następujących modeli:
2 modeleS80 (1999–2006), XC90 (2003–)
Pokaż modele wg rocznika i silnika (2)
Co oznacza ten kod błędu?
Although the code is named for a low signal, it concerns the sensor on bank 2 not showing a lean mixture. At fuel cut-off the sensor should show a lean mixture, and the code is set if it does not, or if the change to lean takes too long. The cause may be a leak in the exhaust system or a damaged sensor.
Możliwe przyczyny
- Leak in the exhaust system
- Damaged rear oxygen sensor
Co możesz zrobić
- 1Read and clear the code, then road test with stretches where the engine brakes without throttle
- 2Inspect the exhaust system for leaks, since a leak can stop the sensor responding as it should
- 3Check that the connector to the rear sensor on bank 2 is clean and secure
- 4If you have a diagnostic tool: read the oxygen sensor signal in live data while the engine brakes without throttle and see whether it shows a lean mixture
- 5If no fault is found, have a workshop decide whether a new rear oxygen sensor is needed
Objawy, które możesz zauważyć1
- Malfunction indicator lamp (MIL) lit
Ogólne wskazówki dla właścicieli. Diagnostyka na samochodzie może wskazać inną przyczynę.