This Audi A1 TFSI came into us with poor running, noisy and the engine management light was on! We carried out a diagnostic code read to find the reason for the EML light to be on which gave us several codes relating to an incoherence between the cam and crank shaft sensors.
The next step was to partially strip down the engine on the Audi to access the timing chain, once stripped we were able to see if the timing marks for the chain lined up with our specialist timing tools, then check for any signs of stretching or damage to the chain and gears.
In this case it was quite obvious, once the timing chain cover was removed we could see that the chain had stretched so much that even at full extension the chain tensioner couldn’t tension the chain, thus causing the timing marks to be miss aligned.
We sourced a new timing chain kit and tensioner for the A1 and fitted it making sure to check all timing marks were lined up as per factory settings, then rebuilt the engine using new gaskets, oil filter and some fresh oil.
After the rebuild we cleared all the existing codes relating to the timing issues and tested the engine which sounded nice and quiet compared to when it came in to the garage, the engine management light stayed out and all sensors read as they should.
Lastly we carried out a long road test before handing it back to a happy customer.
This seems to be a common fault on this 1.4 TFSI engine which is fitted across the VAG group of vehicles, VW, Audi, Seat and Skoda.
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