EMISSION WORKSHOP WARNING, NO ERRORS WHEN RAC CHECKED CAR.......

[Matthew Green]

Hello I am new to the forum but need some urgent help please. My car shut down after a 2 hr drive into London after stuck in traffic with the warning "emission error" showing. After calling the RAC they did a check but the car showed no errors. The exhaust emission check (sign with a lightning bolt) light is on before i start the car but disappears when started. The car now starts and drives now recovered, and sounds fine but was sounding very rough when stuck in traffic before it broke down. Any help will be greatly recieved. Looking on google it could poss be the exhaust manifold valve or pss lambdor sensor

[richw911]

Sounds like it could well be the lambda sensor that should throw a code though 

Get yourself one of these will save you time and money in the future :

http://www.ebay.co.uk/itm/VW-VAG-Diagnostic-Fault-Code-Reader-CAN-OBD2-/160665436011?pt=UK_Diagnostic_Tools_Equipment&hash=item256867ff6b

[Matthew Green]

thanks think i will get one of these for future but surely if the RAC did the same check it came back as the car was fine, wouldnt the reader you advised show the same?

[mcgee9t2]

yeah that reader should show just about any code and can reset/wipe all codes off.

cant see why it wouldnt show a code if it was lambda though.

unless you car somehow reset its self