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Category: Vauxhall
Satisfied Customers: 1192
Experience:  Vauxhall diagnostic technician
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2003 Omega Estate CDX. Engine warning light on all the time.

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2003 Omega Estate CDX.
Engine warning light on all the time. LAMBDA Sensor has been renewed and warning light stayed out for two days. Warning light is now on again all the time.
Starting from cold is 'LUMPY' but runs perfectly after.
Suggestions ???
Welcome to Just Answer,

I have seen this fault a couple of times and was caused by an exhaust blow on the manifold, they normally blow by cylinder 1/2 either by a broken stud or a cracked manifold.

This then lets air in causing the O2 sensors to read in correctly and this causes the wrong mixture on start up.

I hope this helps, best regards, Vauxdoc.
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