Running Issues, Engine Management Light On And Uneven Idle On A Mazda 6 (2009 - 123,220 Miles) - F5 Engine Carbon & DPF Clean

Running issues, engine management light on and uneven idle on a Mazda 6 (2009 – 123,220 miles)

Adrian @ F5ECC

⚠️ Vehicle not running properly? Engine Management Light on? Get it properly diagnosed before it creates further issues.

Here we have a Mazda 6 (2009 – 123,220 miles) with lack of power, Engine Management Light (EML) on and a slightly uneven idle.

ℹ️ Originally booked in as a DPF issue investigation due to a history of DPF Issues back in December 2018 where the DPF was eventually replaced.

✔️ This time around the owner contacted us to get it quickly diagnosed and see what was occurring.

Initial diagnostics brought up the following related engine codes:

P0299 Turbocharger Under boost condition
P0402 EGR Flow excessive detected
P0104 MAF Circuit intermittent/erratic

Further investigation into the live data showed that the DESIRED (requested) boost pressures and rail pressures were fluctuating wildly which is an indicator that the ECU is trying to work from fluctuating values being fed in from the MAF sensor.

We unplugged the MAF sensor and then the idle settled and the desired values steadied to relatively normal values. We documented the codes, emailed them to the owner and then cleared them down which just left the 2 codes related to the MAF sensor.

ℹ️ Running with the MAF sensor unplugged means the vehicle will run from default values and whilst not ideal, this is preferable to the way it was running with it plugged in giving really off readings.

No cleaning on this one and first port of call is to get the MAF issue sorted out (likely the sensor, but occasionally we have seen an issue with the wiring) and then go from there.

Once all resolved then we can return to confirm all is OK and perform our Which? Trusted Traders approved Engine Carbon Clean to get it back to its best.

Given the MAF issues it is fairly likely that this was the original cause of the DPF issues back in December

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Reviews For our Engine Carbon Cleaning Services

1 month ago

Adrian is a lovely fella, explained the process, carried it out well, clearly done exactly what it needed to do as I blew a load of stuff out the back when I drove it after. Will definitely be coming back in the future.

1 month ago

Great job
Car running a lot better

Highly recommend

1 month ago

Steve arrived to give my Jaguar xfs an engine carbon clean. Presently on 107,000 miles. Explained the process and was obviously very knowledgeable about the process and expected outcomes. And he was a thoroughly nice chap.
The V6 in the xfs is a quiet, smooth, powerful unit and I was not sure of what improvements I would get. Well, I’m impressed. The power delivery is smoother, the engine even quieter and 6 mpg better to boot.
If you want to do one thing to maintain and improve your motor, then this is what you should do.

Mircea Marius Popa

2 months ago

Had the pleasure to meet Adrian this morning who performed a carbon clean on my bmw 525d
Very knowledgeable guy, I was really impressed.
Car drives much better now, highly recommend.

Thanks Adrian

Marius Popa

2 months ago

Adrian went above and beyond at every stage. Couldn’t recommend Adrian as a person and the service highly enough.

william farrell

2 months ago

had my jaguar xf sportsbreak car engine cleaned and omg its like new what a great job the power is back Engine diagnostic was brilliant and the service was so good. I would recommend it to anybody.

Tracey Jane King

2 months ago

Leon came out to my car about a month ago. He was brilliant, he did some diagnostics, asked some questions and then got to work sorting out my problem. He was extremely thorough and I could tell he genuinely cares about providing a first class service. Fantastic!

2 months ago

Iv had the pleasure of having 2 Carbon cleans from both Adrian and Mark. Both lovely gentlemen and you can tell they love what they do. My car failed on emissions and this helped me get the car through the test, and at the time, I REALLY needed a pass because I couldn’t get anywhere. These guys saved me. Not only that, it’s a lot cheaper here compared to other places also. Thank you so much and look forward to seeing you in future endeavours.

2 months ago

Great ppl full of advice and very helpful quick to reply definitely use again thanks guys

2 months ago

First class service, very professional and nice guys.
Very knowledgeable on issues with electrical problems with my car.
Arrived on time and completed the work as you would expect from a good reliable company.

Kimberley Everest

3 months ago

What a great experience with Steve today! From start to finish went through the diagnostics step by step with me, explaining everything in detail! Flushed and cleaned the dpf for me cannot fault him at all, work done at ur front doorstep would definitely recommend Thankyou so much for all your help!

3 months ago

Today Adrian from F5 Carbon7 DPF Clean came to de carbonise my xc60 he arrived bang on time he was very courteous and explained in great detail what the process was .
He set up within 5 minutes and went on to the diagnostics and talked me through what was coming up after a reset all was clear. It took about 1 hour in total great job well happy would definitely recommend Adrian well mannered gentleman.

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We are fully insured, IMI Certified, and Which? Trusted Trader approved.

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