what does this plug do?

[C2kev]

Just done an oil/filter change and found this brownish coloured connector unplugged and hanging loose. I've plugged it back in now but what is and what does it do? No idea how long its been like that but I've had no problems with the car

 

[Grancio28]

knock sensor mate

 

[Icarus]

Yep it's knock sensor. You should have a fault code logged for "Knock Sensor Voltage Abnormal" or similar if you read the codes via OBD2 although it may have cleared if you've done a few miles since plugging it back in.

If nothing has broken with it unplugged it definately won't with it plugged back in so don't worry.

 

[C2kev]

nice one cheers, will that explain the diagnostic check i did with my laptop 4 months ago? I had the orange engine light come on boxing day 2010, will this switch off now after a few miles

 

[Icarus]

It may do eventually. If you still have the laptop handy just plug in and clear the codes. I take it from the 0420 that's logged it's decatted?

 

[C2kev]

Ok I'll try clearing the code tomorrow. Its not decatted no (afaik anyway), it passed the MOT on thursday although it did fail the first emissions test but passed the second two after a 2 minute warmup according to the testing guy

 

[Icarus]

Clear the codes and keep and eye to see if they reappear. Emissions code may well be spurious.

 

[C2kev]

I've just hooked it up to my laptop and the knock sensor code had cleared itself. Also managed to manually clear the p0420 code and switch off the orange EML which i couldnt do before so hopefully all problems are now sorted. Not that there was any running problems anyway, just worrying seeing the light on the dash all the time.

Diagnostic machines/checkers.....everybody should have one!

 

[katonna]

how do you get one of these diagnostic cables and programs? expensive or not? will the one you have only work on renault clios or other manufacturers ?

 

[C2kev]

look on ebay for an ELM 327, i paid less than £20 for mine years ago

 

[katonna]

is it just a cable? or do you get a program with it?

 

[C2kev]

mine is similar to this one http://www.ebay.co.uk/itm/OBDII-USB...iagnostic_Tools_Equipment&hash=item19c88fa338 and also came with Digimoto software and Scantool.net software