VOLVO
ECM-251A - Long-term fuel trim. Lower limit
System
Motorstyring (ECM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
4 modellerC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Vis modeller per årsmodell og motor (5)
Hva betyr feilkoden?
The ECM receives information from the rear oxygen sensor about the mixture at different loads and compares it with the front sensor. If the difference between the sensors becomes too large, so that the rear sensor's adaptation reaches one of its end positions, the code is stored. Here the end position concerned is the lower one. The cause can be either sensor or an air leak in the exhaust.
Mulige årsaker
- Contact resistance, oxidation or poor contact in the connectors
- Air leak in the exhaust system
- Damaged front oxygen sensor
- Damaged center oxygen sensor
- Damaged rear oxygen sensor
Hva du kan gjøre
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check the connectors to the front and rear oxygen sensors for contact resistance, oxidation and poor contact
- 3Look for air leaks in the exhaust system, such as cracks and leaking joints
- 4Look at other stored codes in the control module, since they can show which sensor is faulty and help you avoid unnecessary replacements
- 5Have a workshop replace only the oxygen sensors that the fault-tracing points to
Symptomer du kan merke1
- The malfunction indicator lamp (MIL) is on
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