VOLVO
ECM-257C - 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?
The code is set when the engine control module (ECM) sees that the pump current to the oxygen sensor on bank 2 has stopped. The sensor is then given a default value as its signal, even though the fault is shown as a signal that is too high.
Mögliche Ursachen
- Oxidation or contact resistance in the connections
- The pump current wire is broken
- The oxygen sensor on bank 2 is damaged
Was Sie tun können
- 1Clear the code, road test the car and check whether it comes back
- 2Look at the connector at the lambda sensor: it should be seated firmly and free from oxide. Keep rust solvent spray and grease off the connector
- 3Use a multimeter to check that the pump current wire to the sensor has continuity throughout
- 4Look for breaks and chafing on the wires, especially where they lie close to heat
- 5If the wires are intact but the fault remains, have a workshop check the lambda sensor
Symptome, die Sie bemerken können1
- Malfunction indicator lamp (MIL) on
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.