VOLVO
ECM-252D - Front heated oxygen sensor (HO2S), bank 2. Signal missing
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerS80 (1999–2006), XC90 (2003–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
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.
Mulige årsaker
- 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
Hva du kan gjøre
- 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
Symptomer du kan merke1
- The malfunction indicator lamp (MIL) is lit
Hva feilen kan påvirke1
- Catalytic converter diagnostics are switched off
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