My G2/62 is on it's way out (due to be replaced in a week when I can get it booked in) but it only throws an intermittent error code and no MIL, plus the temp gauge "seems" fine. FWIW.
G
Fans staying on long after engine stops ...
Mine is exibiting this as well. except that it comes on at water temp 170 F and stays on after engine is switched off.. All gauges are normal.. no MIL but the techs said the bearings were failing in the 600w fan so they have orderd a new one from der fatherland and a new control module is attached to it. should solve problem.
there are 2 separate monitoring functions: one for the cooling system, and the other for the engine coolant sensor.
the temp sensor will throw codes (range: p0116, low: p0117, high: p0118) when "rationality" of readings is in doubt. these codes are only thrown after a number of on/off engine cycles. the decision is made after consideration of the difference between successive high and low values (above the thermo control temp). only when this is true does a mil get thrown.
the cooling system has the p3081 code (cooling temp too low), and p2081 "cooling system performance" for when the engine doesn't warm up fast enough (based on calculated air mass flow).
interestingly, there is no code thrown for *cooling system* over temp, only one for the *temp sensor* "out of range" or "stuck".
considering the above, it appears that the main focus on for bosch in me7 is efficient warming up - therefore on emissions, not on whether the cooling system is protecting the engine.
the temp sensor will throw codes (range: p0116, low: p0117, high: p0118) when "rationality" of readings is in doubt. these codes are only thrown after a number of on/off engine cycles. the decision is made after consideration of the difference between successive high and low values (above the thermo control temp). only when this is true does a mil get thrown.
the cooling system has the p3081 code (cooling temp too low), and p2081 "cooling system performance" for when the engine doesn't warm up fast enough (based on calculated air mass flow).
interestingly, there is no code thrown for *cooling system* over temp, only one for the *temp sensor* "out of range" or "stuck".
considering the above, it appears that the main focus on for bosch in me7 is efficient warming up - therefore on emissions, not on whether the cooling system is protecting the engine.
After a couple of weeks of fans running at full speed, the true cause became apparent on Thursday - i was rescused by the AA and traveled home on the back of a flat bed truck - 10 out of 10 for those who said Thermostat - the car finally started to show signs of overheating on the M1, so i pulled over and sobbed onto the steering wheel !. Audi quoted £18 for the Thermostat, and £1000 to fit it - Spoke to the warranty company on friday and spoke to the same guy who was looking after my DRC failure - another couple of grand claim !! - i could actually hear him groan when i broke the news to him, but they are covering the cost of it so i can breath a huge sigh of relief .........
After all the trouble i have had with it (Over 3k of bills in the first 3 months !!) i am now considering selling it ..........
After all the trouble i have had with it (Over 3k of bills in the first 3 months !!) i am now considering selling it ..........
that leaves the g2/62 or the thermostat. they have very similar failure symptoms. i spent 2 weeks chasing and fixing a g2/62 only to find the thermostat had gone as well (on my old s8). remember that the g2 is the ecu sender, while the g62 (in the same body) is the dash/climate sender. hence it is possible to get a correct dash reading while the ecu doesn't. use vagcom to get the real ecu reading.
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alangjones
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