2000 E46 323ci - Lambda Sensor?

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  1. 2000 E46 323ci - Lambda Sensor? 
    #1
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    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.
     
     

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    If its messing with your fuel consumption it will be the two before the CATS. The two after just check on the CATS to make sure they (the CATS) are working. They are easy to get at on top of the exhaust manifold and the Bosch ones are around £90 each. Although as they have a cable coming out of the top, you do need a special socket, but there are plenty on ebay.
     
     

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    £90? Wow that's quite steep. Do you think it's a good idea if I replace the pre CAT ones on my own since they're easier compared to the post CAT? And is £90 really the cheapest? That means 4 would add up to around 400 which is quite a bit..

    Also how would I know whether or not the sensors are working?
     
     

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    I think its worth £45 to get the codes read as it will specify bank 1 or bank2 as faulty. (Bank 1 is at the front of the car). You can get cheaper ones on ebay but many people seem to have problems with them and end up changing them again within 6 months for the Bosch ones.
     
     

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    What about NGK? I might be able to get them at wholesaler prices from Motor Parts direct but that's still expensive!
     
     

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    I think if you stick with a well known brand you should be OK. It seems prety general, a friend of mine had a new one in his Volvo from ebay that only lasted 2 months.
     
     

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    My NGK one has lasted and works just fine.
    Ultimately it is your decision.

    As before, if your fuel consumption is lower it will be one of the pre-cat sensors, and you need to replace it (or them) before the overly rich mixture starts to damage the cats.
    You can leave the post-cat sensors. An MOT will pick up on failing/failed cats anyway, you won't need the car to tell you.
     
     

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