Tag Archives: Aarons Autos

Mercedes-Benz A200d Carbon Build Up In Engine.

This Mercedes A200d with the 2.1 diesel engine came into us for a Diagnostic Code Read because its EML (Engine Management Light) was on.

The Codes were –

  • P0401 Exhaust gas recirculation (EGR) system – insufficient flow detected
  • P0638 Throttle actuator control (TAC), bank 1 – range/performance problem
  • P200A Intake manifold air control actuator, bank 1 – performance problem

After checking some of the live data we decided to remove the EGR pipe to have a look inside the intake system, the system was full of carbon build up which was causing blockages.

After speaking to the customer we found that he only uses the car for short journeys and it very rarely gets a long run.

We are seeing this as a weekly occurrence at the moment, modern diesel engines are not designed for lots of short journeys they are more designed for long distance commuting.

When a modern diesel engine is driven on a long journey it carries out a DPF (Diesel Particulate Filter) regeneration which basically means it cleans out the exhaust system of carbon and soot build up, the same carbon and soot is found in the engine and long journeys help to clean that too.

Once we had cleaned out the intake and EGR system we cleared all stored engine codes and took the Mercedes for a long road test, upon return we carried out another Diagnostic code read and none of the codes had returned and all live data was reading correctly.

The car was given back to its owner and we also advised him to go on at least one long drive per week or the car would be back to us with the same fault.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

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.

Cancelled Bookings Cost Time and Money!

Over the last couple of years we have seen a large increase in jobs being cancelled last minute by customers and also not turning up for their appointment on the day.

This in turn has a major affect on the day to day running of our workshop as we allocate jobs to our technicians based on Labour times to maximize the efficiency of our workshop.

When a Labour intensive job doesn’t show up for example a Clutch or a Cambelt the technician that was booked to carry out that job has no work and not only is that a cost to the workshop but it also affects other customers that are waiting to book in for work as they could have used that slot.

Going forward we have made the decision to take a £50 deposit for all jobs that are expected to take over two hours which will only be refundable if the job is cancelled at least 48 hours before its booking slot.

This will allow us to book in other customers who are waiting for our Services.

We understand sometimes it is out of your control and you have to cancel but we hope you understand our position, this is a hard time for all small business’s.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Ford Transit 2.0 EcoBlue TDCI Wet Belt Problems!

The Ford Transit is probably one of the most common vans seen on the road today and is championed by tradesmen and delivery drivers up and down the country.

With the latest edition to the Transit range the 2.0 EcoBlue TDCI you get a Timing Belt in replacement of the old Timing Chain which Ford recommend to be replaced at 150,000 miles or ten years.

What we are seeing in the trade though is timing belt failures well before either the 150,000 mile interval or the ten year time frame.

We are recommending customers to get theirs changed around 60,000 miles or five years to prevent the chance of failure and a hefty bill for un-necessary engine repairs caused by the failure.

Transit Timing Belt



Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Cars vital for second ‘staycation’ summer, RAC research reveals

Some 70 per cent of motorists set to use their car or motorhome for a summer get away

Cars vital for second ‘staycation’ summer, RAC research reveals

More than four-in-10 drivers in the UK (43 per cent) already have firm plans for a UK staycation this summer, according to research carried out by the RAC.

While only 13 per cent of the 2,100 drivers surveyed in April said they hoped to head abroad this summer, nearly half of this group (48 per cent) said they would try to take a holiday somewhere in the UK if coronavirus restrictions made going abroad impossible – which could have the effect of swelling traffic volumes during the summer months.

A quarter (24 per cent) said they would look to delay their trip to another date when restrictions are hopefully eased, whereas 16 per cent say they would simply forego a holiday this summer.

One-in-10 (11 per cent) were uncertain as to what they would do in that event.

With official data showing that 19 of the 20 countries to which UK residents make the most visits in the summer are currently on the government’s ‘red’ and ‘amber’ list and are effectively off-limits, the RAC research points to the possibility of an extremely busy summer on the UK’s roads.

Related: One in five car owners never check engine oil, research finds

Of all of those planning to get away, a quarter (24 per cent) took the decision to book last year while another quarter (25 per cent) waited until this year.

But the remaining half (51 per cent) say they plan on sorting out a summer break at shorter notice.

More than four-in-10 (44 per cent) of the those surveyed don’t expect to take a summer holiday at all this year.

RAC spokesperson Simon Williams said: “For those heading off in the UK this summer it’s very apparent that the car is going to be the transport mode of choice.

Related: Average age of UK cars rises to 8.4 years

“What’s more, if those who have foreign trips planned can’t take them there is every chance the roads will be far busier than they would be in a normal summer, especially if we’re blessed with good weather as this will cause the number of day trips and weekend breaks to rocket.

“If traffic volumes really do swell this summer, it could turn out to be more important than ever that drivers check their vehicles before setting out to avoid a breakdown at the roadside – oil, coolant and screenwash levels should be checked, and all tyres should free of damage and inflated to the right levels for the load being carried, particularly if the whole family is on board and the car is jam-packed.

“Anyone who’s put off getting their car fixed or serviced during Covid should take action sooner rather than later to avoid their staycation being spoilt by a breakdown.”

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Power Flex Suspension Bushes For This BMW Z4.

Suspension bushes on all cars go through tremendous stress on a daily basis, some manufactures have got the design right and the bushes can last the life of the car whilst other manufactures just didn’t quite get there!

One of the problems with BMW’s in general is the front suspension bushes. Most of the BMW range suffer with the front suspension arm bushes either failing or being so worn that it causes the car to wander on the road whilst driving and can feel unstable when braking.

Replacing the bushes with either after market bushes or genuine bushes does sort out the problem, but with the condition of the UK roads and the fact that most BMW’s come with low profile run flat tyres the new bushes can be worn out within a couple of years.

The solution on this BMW Z4 was to fit some Power Flex nylon bushes, these bushes are mainly used in Motorsport but can be fitted to road cars.

Watch this video to see just how much movement was in the old worn bushes compared to the new Power Flex nylon bushes.

On the Z4 replacing just the lower suspension arm rear bushes was enough to transform the steering from a loose discouraging feel to a nice tight direct feel that a sports car should have.

For more information on whether Power Flex bushes would suit your car or just for more information give us a call on 01332 205070

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Citroen Berlingo with ABS Wiring Fault.

A 2014 Citroen Berlingo came in to us with an ABS fault to be looked at.

First thing to do was carry out a diagnostic code read to see why the ABS light was on, the particular code for this Citroen Berlingo van related to an open circuit on the rear left wheel speed sensor.

We checked the actual wheel speed sensor for a fault but it checked out ok, next job was to check the wiring from the sensor back to the ABS pump.

Most of the wiring for the rear ABS sensors is hard to access as it runs inside the van. once we had determined that there was in fact a break in the wiring from the left rear sensor and the ABS pump (by checking continuity of the wires) it was time to start stripping the interior and physically check the wiring for a break.

After removing the passenger seats and lifting the carpets to access the wiring we noticed part of the raised carpet flooring had been trapping the ABS wiring loom between a raiser and the body and over time had rubbed through the wiring and caused it to short out against the body.

ABS wiring trapped under the carpet.

We repaired the wiring and and rechecked for continuity through the loom which we now had. Time to clear the stored fault codes and check for a wheel speed signal using the live data on our diagnostic scanner, perfect, the signal was good and the same as the rear right wheel, time to rebuild and road test.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Land Rover Discovery 4 Front & Rear Wishbone Replacement.

The owner of this Land Rover Discovery 4 decided he wanted to replace all four of the lower suspension arms as they had excessive wear in most of the bushes (common problem).

After a bit of research he booked it in with us to carry out the work for him.

Anyone who has tackled this job before will know its not a five minute job, especially when the bolts seize inside the bushes!

First thing we always do on jobs like these is to wire brush all the bolts and spray them with freeing oil in the hope to make life easier for us.

This did work on 50% of the bolts but there were several that no matter what we tried they needed to be cut out.

After replacing all the arms it was time for a full geometry setup as the arms had adjustments for Camber, Castor and Toe.

I must admit once all the work had been carried out the Discovery 4 drove perfectly, there was no more wandering at speed the steering was precise and not loose, it felt like it should do.

We did advise the customer to bring the Discovery 4 back after a few hundred miles so we could re-check the geometry once all the suspension components had settled in.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.

Vauxhall Corsa D 1.2 (A12XER) Timing Chain Rattle.

We had this little Vauxhall Corsa 1.2 booked in with us for a ‘really bad engine noise’.

Once the car was in the workshop it became apparent very quickly what the noise was, the Timing Chain was rattling so bad we were surprised it hadn’t jumped a tooth and caused engine damage!

When we were stripping the engine down to put the Timing Tools in place we could see just how badly stretched the chain had become, the crank locking pin went straight in but both cam shafts were out by quite a lot.

There are several variants of the Vauxhall timing chain engines most of which requiring different timing tools which we have, 1.0 – A10XEP, 1.0 – A10XER, 1.2 – A12XER, 1.2 – A12XEL, 1.4 – A14XEL, 1.4 – A14XER, 1.4 – A14NET to name just a few.

Timing Tool A is for the Camshaft Position Rings, Tool F is for the Camshafts.

After removing the timing chain cover we could start to see what had caused the problem, the oil was very black and there was a lot of burnt carbon oil inside all the covers.

All engines require regular servicing to keep them in tip top condition but especially modern engines that run a timing chains rather than a timing belt, we are seeing more and more engines requiring timing chain kits prematurely due to a lack of servicing, poor quality oil or the wrong spec oil.

Once we had replaced the timing chain kit and re-aligned all timing marks it was time to clean all off the engine casings and refit, replace the oil and filter and refill the coolant.

When we removed the oil filter this gave us another indication of what had caused the problem, the middle of the oil filter had been sucked in, caused by the paper element of the filter being completely full of oil carbon and struggling to allow fresh oil through it, which in turn starves crucial parts of the engine of oil (timing chain) allowing them to wear, over heat and stretch.

On this particular car we advised the customer that over the next 20,000 miles they should have several oil and filter changes to help remove carbon deposits that we couldn’t see or get to whilst doing the job and this will help increase the life of their engine.

Aarons Autos car service garage.

Your friendly car garage in Derby

Give us a call at Aarons Autos for more info.