VOLVO
ECM-25BC - Front heated oxygen sensor (HO2S), bank 2. Signal too high
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
2 ModelleS80 (1999–2006), XC90 (2003–)
Modelle nach Baujahr und Motor anzeigen (2)
Was bedeutet der Fehlercode?
Although the fault is shown as a signal that is too high, the ECM compares the front and rear oxygen sensors on bank 2. If the front shows a rich mixture while the rear shows a lean one, the code is set. The problem may lie in either of the two sensor circuits.
Mögliche Ursachen
- Air leakage in the exhaust system
- The front oxygen sensor gives an incorrect signal
- Damaged oxygen sensor
Was Sie tun können
- 1Check the exhaust system for air leakage, since a leak can affect the sensor readings
- 2Read the code, clear it and road test the car to see whether it returns
- 3If the exhaust is sealed but the fault remains, have a workshop check the oxygen sensors
- 4If the fault returns after these checks, have a workshop replace the oxygen sensors
Symptome, die Sie bemerken können1
- Malfunction indicator lamp (MIL) on
Was der Fehler beeinflussen kann2
- Oxygen sensor control is switched off
- Catalyst diagnostics are switched off
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.