Was bedeutet der Fehlercode ECM-25BB?

Diagnose und Fehlercodedefinition für ECM-25BB (Volvo S80 (1999–2006), Volvo XC90 (2003–)). Steuergerätereparatur bei OBD Tuning.

VOLVO

ECM-25BB - Front heated oxygen sensor (HO2S), bank 2. Signal missing

System

Motorsteuergerät (ECM)

Volvo-Modelle, für die dieser Fehlercode gilt

Gilt für folgende Modelle:

2 Modelle

S80 (1999–2006), XC90 (2003–)

Modelle nach Baujahr und Motor anzeigen (2)

Was bedeutet der Fehlercode?

Although the fault is shown as a missing signal, the ECM compares the learned correction values for the front and rear oxygen sensors on bank 2. If they differ too much from each other, the code is set. The problem could lie in either the front or the rear sensor circuit.

Mögliche Ursachen

Leakage in the exhaust system
One of the oxygen sensors shows a richer mixture than the other
Contact resistance or oxidation in the connectors
Damaged oxygen sensor

Was Sie tun können

1Look for air leaks in the exhaust system, especially upstream of the oxygen sensors
2Read the code, clear it and road test the car to see whether it returns
3Check the oxygen sensor connectors for contact resistance and oxidation. No rust solvent spray or grease in the connectors
4With diagnostic equipment, compare the front and rear oxygen sensor live data while driving and see whether they differ more than expected
5If the connectors and exhaust are in order, one of the sensors may be damaged. Have a workshop check them

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.