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Hey guys and girls! First post here but I’ve been looking through these forums for a couple months now and they’ve been so useful! Absolutely love my Polo 6N2, my first car and I couldn’t be happier! But I do have one reoccurring problem which is really starting to annoy me. I keep getting a check engine light come on, and after scanning the ECU I get the following code: P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) Got my local mechanic to replace the lambda sensor. Car worked perfect for a couple weeks until I got another P0134. He said that the part was faulty (its a genuine Bosch part cost me £130) and he replaced it. Now a couple months later I’m getting the P0134 error again and the lambda sensor is not working (poor economy, poor performance). I thought originally it could be wiring related but since the new sensor worked for a couple months I thought it must be the sensor. I don’t know what to do and I doubt my mechanic is going to replace the part again (he always wants the car in for ‘diagnostics’ and basically hates my pride and joy). Side note: recently under hard acceleration every now and again cylinder 3 will misfire (assume I need to fit new spark plugs in). Could this in anyway cause the lambda to fail? Really annoying that the car is currently slower than usual and burning a lot more fuel (passengers always complain of fuel smell) Thank you so much for reading!