VOLVO
ECM-256B - Front heated oxygen sensor (HO2S), bank 2. Signal missing
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 missing signal, it concerns an implausibly high signal from the oxygen sensor on bank 2 at fuel shut-off, at a time when the calibration current has stopped. Poor contact in the connections or a damaged sensor may be the cause.
Mögliche Ursachen
- Contact resistance and oxidation in the connectors
- Open circuit in the wire carrying the calibration current
- Damaged front oxygen sensor on bank 2
Was Sie tun können
- 1Read the code, clear it and road test the car to see whether it returns
- 2Check that the connector at the lambda sensor is secure and clean. Do not use rust solvent spray or grease in the connector
- 3Look for breaks and chafing on the wires to the lambda sensor, and check that they do not rest against hot parts
- 4Use a multimeter to check that the wires to the lambda sensor have no open circuit
- 5If the connector and wiring are intact the sensor may be damaged; have a workshop check it or replace it
Symptome, die Sie bemerken können1
- Malfunction indicator lamp (MIL) on
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.