DPF issues? A proper diagnostic consultation is key to identify the root cause – BMW 118d (2008 – 158,778 miles)

Adrian @ F5ECC

❗ You never know what you are going to find both under the bonnet

⚠️ DPF issues? A proper diagnostic consultation is key to identify the root cause.

Here we have a BMW 118d (2008 – 158,778 miles) booked in for a diagnostic consultation to investigate a DPF issue with a potential DPF Clean to follow if needed.

Having preciously been looked at by a BMW dealer the owner was told that they couldn’t get it to regenerate and the DPF was blocked.

Having used us a couple of years ago for an Engine Carbon Clean the owner contacted us to investigate.

Initial inspection found that the MAF sensor was not attached which explained the MAF and IAT codes. (Soon as it was reattached then the codes switched from active to historic and then cleared successfully). One issue resolved

Further investigation on the diagnostics found the usual DPF codes along with codes for 2 of the glowplugs and the glow plug controller. This will be the underlying cause for the DPF regeneration not working.

Further checks were performed to rule out the EGR and thermostat being an issue – the car appeared to be holding temperature OK at 85°C. The actual reading on the DPF differential pressure sensor showed between 19-25mbar at idle which suggests the DPF is NOT blocked. A healthy value should be approx 6-10mbar, but typically it won’t be blocked until much higher than 25mbar.

‍Conclusion on this one was now to replace the glowplug controller and the two glowplugs ASAP. Ironically the garage had replaced the other two earlier in the year, but didn’t suggest replacing these two or the controller at the time as a precautionary measure.

Once that is done then with a regeneration drive all should be good

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles) — MAF Sensor not plugged in

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles)

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles)

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles) — EGR Data looking OK

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles) — DPF Differential pressure sensor showing higher than normal, but at 19-25 mbar it isn’t blocked yet

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles) — Holding temperature at 85 degrees suggests the thermostats are OK

DPF issues? A proper diagnostic consultation is key to identify the root cause - BMW 118d (2008 - 158,778 miles)

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Reviews For our Engine Carbon Cleaning Services

6 hours ago

The person came and kept me up to date and explained thing to me.

2 days ago

Great service managed to get me in same day and ran me through every issue that was showing even sending screenshots so I have them to pass to the garage.

1 week ago

Excellent service, i can't believe how responsive my rs6 v10 is after a carbon clean. Way cheaper than I thought it would be as well

1 week ago

I Have used F5 Engine Carbon & DPF Clean many times over years this would be the only company I would to perform such task thanks again

2 weeks ago

I had issues with my DPF on my 4.4 Range Rover so hot in touch with F5 and Leon came out to me to carry out a DPF clean. Not only did he tell me exactly what he was going to do but carried out a full diagnostic on my car just to see if there was any underlying issues other than dpf. He gave a really good explanation of the process as he checked all the boost pipes and inter coolers for leaks He couldn’t have been anymore friendly than he was and certainly knew his stuff. Dpf all unblocked and engine is back to normal. Couldn’t recommend F5 enough.

2 weeks ago

After going to merc tech in hull wgere they outright lied to me and attempted to charge me for work they never did. I found f5 by chance pulled out all the stops to get me up and running again. Steve was the best. He explained the full procedure and worked professionally THANKYOU.

2 weeks ago

I needed a DPF inspection quite quickly. I contacted Leon and he responded very quickly. Nice and easy to arrange, coming to our site, on time as promised. Leon was a very friendly chap, very knowledgeable, clearly explaining the whole process. All very simple, no stress and made my life a lot easier. I would have no hesitation in recommending.

Mista Strickland

2 weeks ago

Excellent service. Fast and reliable, great communication from them and turned up on time. Sorted my DPF issue on my van fast and well priced.

Mohammad Hossen

3 weeks ago

Fantastic service from Leon- what a knowledgeable gentleman who did a thorough check and diagnostic and advised accordingly on key issues. Car run beautifully following the carbon engine clean.

michael mcneive

3 weeks ago

I had a DPF clean which has worked perfectly and got my diesel Rav4 back into perfect driving condition. Steve, the technician was very friendly and talked me through the whole diagnosis and treatment.

4 weeks ago

Recently bought a Mazda cx5 diesel and wanted piece of mind the engine had been cleaned. I was getting at most 44mpg (best I had got) I am now getting 49mpg. Well worth it and great people. Thanks again !

4 weeks ago

Just had my car done by F5ECC. Adrian talked me though how the process works. This is the second Merc I have had done by him in 2020. C250cdi and now a C350e sport. Noticed straight away more mpg. The car felt a lot smoother on acceleration. I was quite shocked at how much quicker and responsive the car was when I put it in sport+. I highly recomend having this done. Alan Moore. 66 plate C350e 75000 miles.

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