This car is running rough and cutting out. The fault code logged is 'Emission Contol o/s' I feel this is the o2 sensor, however it is switching, but slowly and it HAS been replaced with an after market one [Part no 0258 986 506]
I have checked fuel pressure/flow, injector duration 1.6ms idle, tps, map, cts all ok. My thought is, that I have found that not all cars run well on after market o2 sensors.
Your thoughts or hints would help
Simon
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