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The knock sensor is located up on the back of the engine block behind / below the inlet manifold.....and you can change it yourself --

Im a bit concerned as to whether you have the right part here though... a Knock sensor is never referred to as a "nox" sensor... but an o2 sensor maybe...

It would be as well that you get a proper explanation from the mechanic who did the diagnostic as to exactly which part was shown to be faulty...

I Sincerely XXXX X have helped you - Please ask me if you need more help...

Kind Rgds,.... MIKE

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Hi there - Thats no problem at all ;)

I did think you may have meant that .... You are right - with all the sensors, names etc can get confusing , I fully agree!

Im sure on the Golf its on the front downpipe -- but its easy to find - Just start at the very front of the exhaust system....look down the piping and you will come across it... you will see it screwed into the exhaust - with wires coming from it to a simple connector..

Some cars have two - yours has one I believe - in any event - its the one nearest the front you want...

You can replace the sensor yourself - there are special designed sockets available to fit the sensors passing the wires... You can get them for about £10. from car shops or motor tool shops - even on line... Do a search for Lambda Sensor Sockets or "tools" on ebay or google -- They are a deep socket with a slot in the side - ( so that you can recognise it when you see it )...

The sensors can be in very tight --so you do usually need a socket and sometime some heat from a good blow torch ...

Once you fit a new one - the light should go out again in its own... If not - you can try a disconnection of the battery for 30 mins to reset the ecu.... or , last resort - a diagnostic tool to do it -- but usually you don't end up having to use one...

I Sincerely XXXX X have helped you - Please ask me if you need more help...

Kind Rgds,.... MIKE

• >>>>>>>>>Please don't forget..........

PS...Please press the ACCEPT button if you are happy with my answer/advice given- as thats how I get paid ;)

Feedback is always appreciated too... Thank you .