Code 2142

[steverrquattro]

Went out in the UR a couple of days ago and experienced a lack of power, so upon my return I pulled the codes. It's a 1990 RR engined quattro, similar to the 3B and it came up with code 2142.

Is this the first knock sensor closest to the front of the engine or the one towards the flywheel?

Also, are these relatively easy to change?

Last of all, do I have to go to the stealers or are there other suppliers where I can get it from?

[Rusty]

They're fiddly to get to but easy to change.

make sure you tighten them up to the correct torque, so as not to crush them. 25Nm I seem to remember.

Get the Bosch equivalents, the only differences between the Audi ones are the lead length and connector colour, i.e. nothing that matters.

Change both for what it's worth.

[steverrquattro]

Thanks Rusty.

I genuinely believe that this has been the cause of the hesitation problem all along, but was never completely broken to the point where it would show up in the ECU codes.

I'll give GSF a call and see what they can do when I find some part numbers.

G61 054905377A (Bosch 0261231038 @ £27.45 GREEN)
knock sensor with wiring harness
740MM green /

G62 054905377 (Bosch 0261231036 @ £18.70 & £32.75 BLUE)
knock sensor with wiring harness
520MM blue /

[Mikes2]

G61 is the front sensor

20 Nm

[UrS4boy]

Knock Sensor Codes and G61 and G66 Info

•2141 (Blink Fault Code), 00535 VAG1551/2 Fault Code Number
Knock regulator #1
Excessive knock, timing is being retarded by maximum amount,
Symptom: Low boost on 20V, Fuel octane too low, Excessive Compression, excessive boost

•2142 (Blink Fault Code), 00524 VAG1551/2 Fault Code Number
Knock sensor #1 (G61)
Open or short circuit, Defective sensor Check sensor and wiring
Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained

•2143 (Blink Fault Code),00536 VAG1551/2 Fault Code Number
Knock sensor #2, (Cylinders 3, 4, 5)
Excessive knock, timing is being retarded by maximum amount.
Symptom: Fuel octane too low, Excessive Compression, excessive boost

•2144 (Blink Fault Code), 00540 VAG1551/2 Fault Code Number
Knock Sensor #2, (G66) (Cylinders 3, 4, 5)
Open or short circuit, Defective sensor or wiring
Symptom: Timing retarded, High fuel consumption, power loss, Boost pressure not attained

G61 and G66 Knock sensor info:

http://forums.quattroworld.com/s4s6/msgs/21047.phtml

Replacement torque is 20 Nm (15 lb-ft).

[steverrquattro]

UrS4boy - top information reference the link. Thank you very much!