nk1 Posted November 8, 2008 Report Share Posted November 8, 2008 hi guys, engine management light has come on (03 plate S3) and mechanic hooked it up to comp & following codes came up: 17524 - O2 heater circuit (Bank1-sensor1) Open circuit P1116 & 17511 - O2 heater circuit (Bank1-sensor1) capacity too low P1103. I think they relate to lambda sensor pre-cat (although I may be wrong!) But my question is where exactly do I look for this heater circuit? Is it easily seen / accessible? TIA Quote Link to comment Share on other sites More sharing options...
Cupramax Posted November 10, 2008 Report Share Posted November 10, 2008 That fault does point to the pre cat o2 sensor. Its on the exhaust just before the cat.... Quote Link to comment Share on other sites More sharing options...
jamieg Posted November 10, 2008 Report Share Posted November 10, 2008 Chances are you won't be able to get to it, I've had a lambda replaced recently "pre cat" and it's a right pain, local garage had to remove the "CV Joint / casing" to get to it - very difficult to even see the lambda, however if needed you can disconnect, on my 2000 1.8T I could disconnect underneath the car just under the gear stick area. A local garage charged £35 to replace exc parts, audi price was something like £200 Quote Link to comment Share on other sites More sharing options...
nk1 Posted November 10, 2008 Author Report Share Posted November 10, 2008 thanks guys, thought I wouldn't be able to get to it myself, but at least I know roughly where it is now, which is a start!!! Quote Link to comment Share on other sites More sharing options...
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