VOLVO
ECM-254D - Front heated oxygen sensor (HO2S), bank 2, heating. 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?
The front oxygen sensor on bank 2 has an electric heater that the engine control module (ECM) controls with pulsed current. With the heating switched off, the signal should not fall below a certain value. If the ECM sees a signal that is too low in that state, the code is set.
Możliwe przyczyny
- Signal wire short-circuited to ground
- Damaged front oxygen sensor on bank 2
Co możesz zrobić
- 1Read the code, clear it and road test the car to see whether it returns
- 2Check that the connector at the lambda sensor is fully engaged and free from moisture and oxidation. Do not use rust solvent spray or grease in the connector
- 3Use a multimeter to check that the signal wire has no contact with ground (chassis) when it is disconnected from the control module
- 4Look for chafed spots on the signal wire, where it may have been pinched or rubbed against a hot or sharp edge
- 5If the wire is intact and the connector is good the sensor may be damaged; have a workshop check it or replace it
Objawy, które możesz zauważyć1
- Malfunction indicator lamp (MIL) on
Na co może wpływać usterka1
- Oxygen sensor control is switched off
Ogólne wskazówki dla właścicieli. Diagnostyka na samochodzie może wskazać inną przyczynę.