For a change this is a fix rather than a problem and I hope it helps a few people with some erratic running problems.
I was getting a intermitent warning on the sensor in the last few weeks and the car refused to start twice but now that is has been fixed it has cured a myriad of problems:
Erratic idle - fluctuates about 50rpm, easily visible on the rev counter
Surging at motorway speeds, especially around 75mph
No throttle respone periodically when at motorway speed. The car doesn't slow down but neither can you accelerate, lasts for a few secounds
Also the consumption has improved, 38mpg on the way there and 48mpg on the way back! Was a slower trip back (150 miles each way) but 5mpg improvement would be realistic.
Now for the pain! Audi wanted £450 to change the sensor and an additional hour for diagnostics.
I had a look at changing the sensor myself and managed to trace the sensor from the where it clips into the harness to where the sensor is mounted. The wiring clips in under the driver-side inlet manifold and as is possible to get to. The actual sensor is mounted on the crankshaft on the clutch side and is not visible and neither will you be able to feel it. Elsawin is not that useful.
I took the car to my "local" garage in Birmingham (I live in London hence the 150 mile roound trip). Up on a ramp, remove the driver-side driveshaft from the gearbox to allow a x-shaped plate to be removed that is mounted onto the bottom of the inlet manifold. With the plate removed he could follow the wire into the gearbox housing. There is a rubber bung to stop water ingress (remove this) and you can get an allen-key onto the sensor. Replacement is the reverse.
Sorry I have no photos but unless you have access good access under the car it may be best left to someone who has.
Total cost, £80 for the sensor from Audi, 1.5 hours labour to fix.
If anyone is around the Birmingham area or is willing to travel I recommend Martyn Billings Automotive. He has looked after my cars for 12 years. 01902 497 985.
He has also done the FSI flaps and cambelt on my car so has experiance of the worse jobs on an FSI.
Cheers
Alex
I was getting a intermitent warning on the sensor in the last few weeks and the car refused to start twice but now that is has been fixed it has cured a myriad of problems:
Erratic idle - fluctuates about 50rpm, easily visible on the rev counter
Surging at motorway speeds, especially around 75mph
No throttle respone periodically when at motorway speed. The car doesn't slow down but neither can you accelerate, lasts for a few secounds
Also the consumption has improved, 38mpg on the way there and 48mpg on the way back! Was a slower trip back (150 miles each way) but 5mpg improvement would be realistic.
Now for the pain! Audi wanted £450 to change the sensor and an additional hour for diagnostics.
I had a look at changing the sensor myself and managed to trace the sensor from the where it clips into the harness to where the sensor is mounted. The wiring clips in under the driver-side inlet manifold and as is possible to get to. The actual sensor is mounted on the crankshaft on the clutch side and is not visible and neither will you be able to feel it. Elsawin is not that useful.
I took the car to my "local" garage in Birmingham (I live in London hence the 150 mile roound trip). Up on a ramp, remove the driver-side driveshaft from the gearbox to allow a x-shaped plate to be removed that is mounted onto the bottom of the inlet manifold. With the plate removed he could follow the wire into the gearbox housing. There is a rubber bung to stop water ingress (remove this) and you can get an allen-key onto the sensor. Replacement is the reverse.
Sorry I have no photos but unless you have access good access under the car it may be best left to someone who has.
Total cost, £80 for the sensor from Audi, 1.5 hours labour to fix.
If anyone is around the Birmingham area or is willing to travel I recommend Martyn Billings Automotive. He has looked after my cars for 12 years. 01902 497 985.
He has also done the FSI flaps and cambelt on my car so has experiance of the worse jobs on an FSI.
Cheers
Alex