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i think? a fault code should be present but the only fault code reader i had access to at the time would not read my cars engine side!!! every other part except the engine :-| and it specifies obd11 so dunno why? how high are your emmisions? mine was reading 0.54 and it needed to be below 0.20 just be aware that to change the sensor you need to drop the cat out which involves a new gasket and 3 studs and new nuts as the old ones always need grinding off usually, you also need a 24 mm spanner, i had to cut my lambda in half as it was so tight a spanner would not budge it!!! a deep socket and aggression/swearing did the trick though ;) as you have the cat off its a good time to give it a good check over, mine was still fine and intact and didnt rattle at all thankfully as a new one is £300 from vw, the sensor was only £80 and the gasket and nuts were pence about £4 in total, took about 2 hours to do the job

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