DB Diagnostics Ltd

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DB Diagnostics Ltd I am offering a mobile vehicle diagnosis and repair work on all makes of trucks, but I specialise in Mercedes-Benz trucks and vans.

I have 15 years dealership training and experience, total of 20 years working on Mercedes truck and van products.

19/09/2026

Sprinter 907 with the best 3.0 v6 OM642 Engine, it has done over 400k miles.

But it has some faults which is where I come in, it has repeated underboost faults. Checks found the silencer thing to be leaking out the seem, this seal is not available from MB but for £70ish you can change the entire housing.

However this was not the only issue, it would have been easy to leave it at that but something was bugging me with the dpf pressure.
When the engine was running is was showing 0hpa of dpf pressure which is too low in my opinion for a 400k mile dpf.
Because I expected the exhaust downstream of the dpf was blocked I removed the downstream dpf pressure hose, this then revealed the blockage downstream. Instantly I had 60hpa of back pressure at idle but when the revs came up I had 600hpa dpf pressure.

Once the SCR cat was removed I found what initially looked like adblue in the exhaust but on closer inspection it was the DPF ceramic. Turns out someone has just ran a drill bit through the dpf but now its falling apart and going into the scr cat causing a blockage.

I left this one for the customer to decide the fix as it needs more work than just the dpf now.

So this was a job for a customer who had engine problems, I think the fuel system is contaminated with either water or a...
19/09/2026

So this was a job for a customer who had engine problems, I think the fuel system is contaminated with either water or adblue.

The vehicle would not run and had some form of contamination in the fuel, they opted for an engine as the vehicle is used daily.

Engine arrived and I replaced if for them, these newer 9 speed autos are nice to work on with them not having oil cooler lines to the radiator. It made the engine removal and fitting a lot easier!

Once engine was installed i programmed the injectors and had to leave the vehicle to be completed by the workshop on site. It was only drain and clean the fuel tank and system.

We did have an issue though the engine was supplied without a wiring loom for a thermostat heating element which this vehicle has. Not sure how this can even happen as Mercedes built the vehicle and some how manage to get the engine fine details wrong. Customer is now waiting to see if the dealership are going to change the loom and rectify this under parts warranty.

Last week we had three 907 sprinters for spring upgrades, two going from single leaf to twin and one from single to a 2+...
10/09/2026

Last week we had three 907 sprinters for spring upgrades, two going from single leaf to twin and one from single to a 2+1 all done on site no issues!

Someone say WETBELT! So i finally got roped into doing one, in all fairness it was simple. All parts bought from Ford fo...
10/09/2026

Someone say WETBELT!

So i finally got roped into doing one, in all fairness it was simple. All parts bought from Ford for peice of mind, sump off, strainer replaced. Next to no belt in sump despite being on 98k miles.

It shows that with the correct oil and driving they can last no problem, but i feel majority are in poor conditions and using wrong oil or for too long.

Nice service job in Huthwaite, air filter, oil filter and oil, fuel filter, adblue filter, power steering filter(no chan...
30/08/2026

Nice service job in Huthwaite, air filter, oil filter and oil, fuel filter, adblue filter, power steering filter(no change interval at mercedes) and air dryer.

Also advised the dpfs are changed as they should have been done last engine service, the customer priced up DPF's with Diagraph but Mercedes beat their quote not by much but which would you prefer?

I know what I would be doing and its not aftermarket, I still barely use aftermarket on the my jobs. You have to be sensible when deciding what to do for the customer and the business.

Nice little multi circuit protection valve and four air tanks to change in Grantham a few weeks ago, picked up the air l...
30/08/2026

Nice little multi circuit protection valve and four air tanks to change in Grantham a few weeks ago, picked up the air leak on the valve at inspection.

Air tanks looking in bad shape so rather than waiting for failure roadside, prevention is better than cure as they say. Job done vehicle is able to be used (not the customers main vehicle) if they need it.

Its not often I get caught out, it happens after all we are only human. This has been an on going issue for about 2 mont...
25/08/2026

Its not often I get caught out, it happens after all we are only human.

This has been an on going issue for about 2 months, the vehicle is an intermittent none start. It played up in Nottingham with gear change and lights etc, he made it back to the yard turned it off now nothing.
At the time i changed the terminal on the rear of the timing case, very common problem.

All was well for 4 weeks or so then back to messing around exactly as before, checked over the vehicle again to find a white powder coming out the heat shrink! Removed said shrink and found the terminal had corroded away quite alot. Replaced the termianl vehicle now starts no issues!

5t sprinter in for A service, rear discs, pads and hand brake shoes!
25/08/2026

5t sprinter in for A service, rear discs, pads and hand brake shoes!

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Mansfield

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