Tag Archives: audi

2017 Audi TT 1.8 TFSI With Fault Code P00b7 – Fixed.

This Audi TT was brought into the Garage with its Engine Management Light (EML) on, after carrying a Diagnostic Code Read we could see numerous codes in its ecu the main one for us was P00b7 which related to poor coolant flow!

When checking the live data we could see that the engine coolant temperature sensor was reading at over 100 degrees whilst the radiator temperature sensor was at a stable 40/45 degrees even after a road test.

The cooling system on this car is controlled by an electronic thermostat which is built into the back of the water pump housing located under the inlet manifold.

To access the water pump housing we removed the inlet manifold for ease, once the manifold was off we removed the water pump and housing for inspection.

inlet manifold and water pump removed

When we removed the cover off the electronic thermostat we could see that the gear on the operating motor had broken off meaning that it couldn’t open the thermostat.

operating gear missing from motor

Using genuine Audi parts we replaced the water pump and water pump housing along with its drive belt then rebuilt the engine so that we could retest for operation.

After running the engine up to temperature we rechecked our live data, the engine temperature sensor was now reaching 98 degrees and then dropping as the thermostat opened and we could see the radiator temperature increase too.

Once the car had been road tested and rechecked for leaks it was handed back to its owner.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

2010 Audi A5 2.0 TFSI Timing Chain Fault.

This Audi A5 was brought into us barely running by a customer for our diagnosis.

We had to push the car into the Garage as it would no longer start! Firstly we carried out a diagnostic code read to see if that would point us in the right direction but there were lots of codes stored and it was hard to know what were old codes and which were relevant codes, however there was a code for ‘Camshaft and Crankshaft Incoherence‘ which normally means the timing chain has jumped teeth.

We decided to carry out a compression test before stripping the engine completely, the compression’s were all low but were similar across all four cylinders.

Once we had removed the front bumper, head lights, radiator and other ancillaries we could now access the timing chain cover. Time to remove the covers and see if the timing is out.

The timing was at least three teeth out on the exhaust camshaft which is more than enough to stop the car running and lucky enough not to cause any serious internal damage.

We check the timing using specific timing kits as shown below.

Timing Tool

This car also has two balance shafts which are ran by a separate timing chain which is also replaced as part of this job.

Balance shaft chain behind main chain

We need to lock both camshafts and the crankshaft into their timed positions using the timing tools before we start fitting the new guides and chain, once the chain is fitted we can release the new tensioner’s and remove any slack out of the chain.

Now we rebuild the engine using new gaskets where required until it is in a position to be turned over by hand, turn the engine twice by hand and recheck the timing marks all ok.

Next we replaced the oil and filter before building up the front end of the car (just in case we need to strip it again).

Time to start the engine, I don’t care how long you have been in this trade it is still a scary time when you first turn that key on a rebuilt engine!

But, first turn and it fired up and ran perfectly.

Now time to rebuild the front end top up coolant levels and road test, the engine ran beautifully and was returned to a happy customer.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Audi S1 Quattro Water Pump and Thermostat Housing Replaced.

Audi’s little S1 Quattro rocket ship has had a few problems when it comes to its cooling system, this water pump – thermostat housing has had seven re-designs since its original design due to failing water pumps and leaking joints.

Water pump – thermostat housing buried under everything!

To replace the water pump – thermostat housing on the Audi S1 Quattro is a fairly big job, we have to:

  • Drain the cooling system
  • Disconnect fuel lines and cooling hoses
  • Remove inlet manifold stabiliser bars
  • Remove the complete inlet manifold
  • Unbolt water pump drive cover
  • Remove the water pump and housing
  • Clean all surface faces and hose joints
  • Rebuild using genuine parts and all new seals
  • Refill with anti freeze and bleed cooling system
  • Road test and re-check
The leaking housing.

The water pump is driven off a small drive belt running from an internal engine shaft and should be replaced along with the water pump – thermostat housing.

New pump fitted, just got to rebuild now!

Once all the work was carried out and all final tests done the car was handed back to a very happy customer.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Audi A1 1.4 TFSI Timing Chain Fault.

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.

If you would like any more information give us a call on 01332 205070 or drop us an email at dave@aaronsautos.co.uk