VOLVO
ECM-252D - Front heated oxygen sensor (HO2S), bank 2. Signal missing
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 titled signal missing, it applies when the front oxygen sensor on bank 2 reacts too slowly to changes in the exhaust gases. The ECM checks how well the sensor has aged and stores the code when its reaction has become too sluggish.
Możliwe przyczyny
- Calibration current and pump current cables short-circuited to each other
- Open circuit in the signal cable (-)
- Open circuit in the cable for calibration current
- Damaged front heated oxygen sensor
Co możesz zrobić
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check the connector at the oxygen sensor on bank 2 for oxidation and loose connections. Rust solvent spray and grease must not be used
- 3Use a multimeter to check that the signal cable and the calibration current cable have no open circuit and are not short-circuited to each other
- 4Follow the cables from the sensor and look for chafing and pinch damage, especially near the exhaust pipe
- 5If the cables are intact, have a workshop with diagnostic equipment check the oxygen sensor
Objawy, które możesz zauważyć1
- The malfunction indicator lamp (MIL) is lit
Na co może wpływać usterka1
- Catalytic converter diagnostics are switched off
Ogólne wskazówki dla właścicieli. Diagnostyka na samochodzie może wskazać inną przyczynę.