Vauxhall Vectra Lambda Sensor Issue

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.

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?

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.

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.