DPF cracked - not convinced

Hi, I’m new here.

After some thoughts and opinions!

I have a 2018 disco sport. Without a warning light, the dreaded ‘DPF full’ has come on 3 times in the last year. The first time in Aug last year I took it to a garage and paid £800 to have it taken off, cleaned, and put back on. The second time 6 months ago I had a ‘dpf specialist’ come out, do a regen on the driveway, also diagnostics said it needed a new adblue injector (which I didn’t get done, tbh time just run away with me).

Anyway, it happened again a couple of weeks ago and I had the same ‘DPF specialist’ come out, his diagnostic came back with ‘cracked DPF’, need replacement adblue injector and need a new EGR filter. So I got a quote for replacement DPF and the other parts, £2500.

He turned off the red warning light of the dash and said he was on holiday for two weeks and would come back and do the job then.

Thing is I just don’t feel it’s right. The car drives absolutely fine, there’s no black smoke or any noises or anything that feels like a problem, just purely the warning light & diagnosis.

I don’t get any warning for these DPF full, just straight to red. DPF man initially said that could be due to the adblue injector when he first came out 6 months ago. He also hasn’t looked at anything whatsoever, just purely diagnostic test. I took it to a friends garage for a second opinion and he said he can’t see any proof of a crack, he said diagnostics can also be wrong. I know it could be internal crack but there’s no smoke, etc. he said he would take it off, clean it and put it back on but replace the adblue injector, EGR filter and some other filter. Job costing still £1800ish.

I’m just not convinced with the whole thing. I’ve been driving it for two weeks (risky) and the light hasn’t come back on, nor does it feel there’s anything wrong with it…

I’m really tempted to get on the motorway and try force regeneration but obvs thinking is that a stupid thing to do?

I’ve attached the two last reports from the DPF man.

Any opinions or experience welcome!

Thanks in advance.
JA

Welcome.

Just a question. You say you are tempted to take it for a blast up the motorway. Well yes its not a bad idea.
But it leads me to the question of what sort of driving do you normally do? is it mostly down to the shops and picking kids up from school, basically just tootling around town?

If that's the case its hardly surprising you are having so many DPF full issues.
Yes the adblue should be fixed. I would have to look for those codes to see if they match to the 1s I have for ref.

J

marjon said:

Welcome.

Just a question. You say you are tempted to take it for a blast up the motorway. Well yes its not a bad idea.
But it leads me to the question of what sort of driving do you normally do? is it mostly down to the shops and picking kids up from school, basically just tootling around town?

If that's the case its hardly surprising you are having so many DPF full issues.
Yes the adblue should be fixed. I would have to look for those codes to see if they match to the 1s I have for ref.

J

Click to expand...

Yea mostly round town driving but my partner is 100 miles away so we drive that once or twice a month. And I use it for long drives monthly/bimonthly.

These are the latest fault codes as per report:

P0313 - Misfire Detected with Low Fuel
P2463 - Diesel Particle Filter: Excessive Soot Accumulation, p2bae nox exceedance, p2baf nox system driver inducement, u02a5 lost communication with diesel exhaust fluid heater, u0402 invalid data recieved from transmission control module, p049b exhaust has recirculation B insufficient flow detected

vanillarebel said:

Yea mostly round town driving but my partner is 100 miles away so we drive that once or twice a month. And I use it for long drives monthly/bimonthly.

These are the latest fault codes as per report:

P0313 - Misfire Detected with Low Fuel
P2463 - Diesel Particle Filter: Excessive Soot Accumulation, p2bae nox exceedance, p2baf nox system driver inducement, u02a5 lost communication with diesel exhaust fluid heater, u0402 invalid data recieved from transmission control module, p049b exhaust has recirculation B insufficient flow detected

Click to expand...

Does the car have an extra diesel injector or does it chuck extra diesel into the engine for the passive and forced regens?

Always worth checking the small pipes to the dpf differential pressure sensor, these can block causing all sorts of errors, plus of course the sensor itself can tell lies, you can check the sensor reading with diag tool, Iirc the tool will tell you the recommended range, and anything outside this range is either blocked pipes or duff sensor.

Problem you can get is the car sees the dpf is blocked, so starts to do a regen, then you arrive at your destination and turn the car off before it has finished the regen, do this again and and again and again, and you will either block the dpf to the point even a forced regen will not clear it , or you will have so much extra diesel in your engine sump you will wreck the motor.

I have read of people fitting an led on the dash that lights up when a regen is taking place, so they know not to switch the engine off until the regen has finished.

Basically the whole system is dogshti, not matter what vehicle it is fitted to, but even I have to admit it does keep the tailpipe emissions super clean.

We have about 40 Daf 18 tonners at work, and they get abused terribly left to idle for hours at a time day after day, regen after regen passive and forced, generally they keep going, but inevitably you get the odd one that has totally had it, like this sorry example.
Sadly these models have a switch on the dash for the driver to inhibit the regen, (in a tunnel/shop/fire risk etc) and as the regen robs some power the first thing they do is press the button, do this often enough and you have the same scenario as switching you car off during a regen

Scania and Daf during regen, note the dpf sensor readings, both are okay.

Leaking adblue injector.