My mechanic did a diagnostic check on my car several months ago and told me that I had a faulty lambda sensor. Since then, it's been around 5 months and my petrol has been going crazy. Just called up a BMW specialist for another diagnostic and they quoted £45 so I'm wondering if I should buy my own kit? Could anyone give me their opinion on this
How much would it cost replace the lambda sensors? I know there's 4 but I don't know which 2 are faulty. My car has also just passed the 100k mile mark. Thank you.