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ottowagner2

Vauxhall Vectra Lambda Sensor Issue

My 2001 Vauxhall Vectra with a gasoline engine has a check engine light and runs rough. There's also an exhaust leak and strong smell. It has about 58833 km on it. Could a defective lambda sensor be the cause? I've heard about oxygen sensors, DEF fluid malfunctions, EGR valves, and NOx sensors, but I'm not sure where to start.

Summary of the thread

A 2001 Vauxhall Vectra with a gasoline engine is experiencing a check engine light, rough running, an exhaust leak, and a strong smell. The initial suspicion is a defective lambda sensor, which could be causing these issues. Suggestions include checking the exhaust manifold for leaks and consulting a workshop for a precise diagnosis. Ultimately, the problem was confirmed to be a defective lambda sensor, which was replaced to resolve the issue.

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4 comment(s)

raphael_dark1

I had a similar issue with my Volvo V70. The symptoms you describe, particularly the check engine light and rough running, point towards a potential problem with the emissions control system. The strong exhaust smell is definitely concerning. While a lambda sensor is a plausible culprit, have you considered checking the exhaust manifold for cracks or leaks? That was actually the source of my problem.

ottowagner2 (community.author)

Thanks for the suggestion. I haven't specifically checked the exhaust manifold, but I will take a look. When your Volvo V70 had this issue, did the diagnostic codes specifically point to the lambda sensor initially, or did it require further investigation to identify the manifold leak?

raphael_dark1

In my case, the initial diagnostic codes were somewhat misleading and indicated a potential issue with the catalytic converter efficiency, which, in turn, could be related to the lambda sensors. It was only after a thorough inspection by a qualified technician that the exhaust manifold leak was discovered. Given the complexities of modern engine management systems, it might be prudent to consult with a workshop to get a precise diagnosis and prevent any further damage. Considering the repair costs, it could be a good investment.

ottowagner2 (community.author)

Thank you for the advice. I took it to a trusted mechanic. After diagnosis, it was indeed a defective lambda sensor. The replacement cost me around 375€. Appreciate your help in pointing me in the right direction.

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VAUXHALL

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VECTRA