VOLVO
ECM-4901 - Three-way catalytic converter (TWC) efficiency, bank 2. Intermittent fault
System
Motorsteuergerät (ECM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
1 ModellS80 (1999–2006)
Modelle nach Baujahr und Motor anzeigen (3)
Was bedeutet der Fehlercode?
The catalytic converter on bank 2 deviated too much at an earlier point, but the engine control module can no longer detect the fault. The fault is intermittent, meaning it comes and goes, and it may already be gone when you read the code.
Mögliche Ursachen
- Misfiring in the engine
- Air leak in the intake on bank 2
- Leak in the exhaust system
- Fuel pressure is wrong
- Uneven compression in the engine
- Catalytic converter is defective
Was Sie tun können
- 1Read off the fault code and note it, erase it and test-drive to see whether it returns
- 2If it does not return, the fault is probably temporary, and no further troubleshooting is needed beyond keeping an eye on it
- 3Check the intake and exhaust systems for leaks such as cracks or loose joints
- 4Have a workshop check fuel pressure and compression if the fault comes back
Symptome, die Sie bemerken können1
- Emissions warning lamp (MIL) lit
Was der Fehler beeinflussen kann1
- Control of the rear oxygen sensor is switched off
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.