[Maceo]

Hi - have a 2017 HONDA CR-V I-DTEC EX - I bought it two years ago and it has been ok. Occasionally the DPF light would come on when hadn't been on a long run for a while, but a quick trip up the M62 would sort. Approx six months ago the DPF light came on with an "!" - after some searching I took it to a DPF specialist who added cleaner and flushed the DPF, and everything was ok.

About 2 weeks ago DPF! came on again. Same technician and flush, and all ok for a day. The technician noted that on flush, not much soot came out of the exhaust, so he was surprised that the regen light had come on. All ok for a day, and then light with "!" back on. The technician suggested the pressure sensor may be faulty as readings on his computer suggested not much particulate mass in the filter - so had that replaced. Again, fine for a day then light with "1" back on. This time he tried a "forced regen" - but couldn't get the engine temp up to 76C to enable this, everytime it hit 69C, the fan kicked in to cool the engine. He suggests there may be a way to adjust the fan, but wasn't sure.

Am booked into the Honda garage Wednesday, but the tech suggested they may just replace the DPF unit, and he doesn't think it needs it - but equally wasn't sure what to do next.

Any ideas would be very welcome.

In case helpful - Tech blew out the pipes and didn't notice any blockage. Car has 44000 miles on clock.

 

[UK-Kev]

Yes, booked in at Honda new DPF exhaust unit required sounds about right.

 

[TheDarkKnight]

If you are only doing long runs once in a while / balance of your trips are low speed/urban, that is the perfect recipe to destroy any DPF.

Diesels simply are not cut out for urban use. If thats what you predominantly do, this issue will crop up no matter what DPF-diesel you drive. I would seriously suggest you get rid and buy petrol instead.

A long run once in a while is not advisable.

DPF-equipped diesels need regular high speed runs to operate at higher temps to ensure the crud in the DPF is burned off.

 

[Maceo]

Thanks for the replies - from reading around the other posts with similar issues, am thinking I will need to trade it in and get petrol version.

Is it worth trying a "Deep Industrial Clean" on the filter from these guys - at £300 - https://www.dpfspecialist.co.uk/ - rather than replace the Unit, in the interim? Have already paid out £300 on a clean and new pressure sensor with a local DPF technician. Costs for replacing unit at Honda suggested anything from £1500 to £3000.

 

[TheDarkKnight]

Waste of money.

Use that £300 towards a new DPF because eventually, you're going to have to replace it.

Once a DPF starts displaying clogged messages, its done.

 

[Black Pearl UK]

What is 'the best' operating range for a diesel nowadays? I imagine there are lots of variables to consider.

Does a modern diesel require high speeds on motorways? Or just higher rpm ranges through the gears etc. Do the I-dtec's work well with a DPF delete etc?

We know that short journeys kill the DPF quickly

 

[TheDarkKnight]

Does a modern diesel require high speeds on motorways?

Yes and for at least 60mins a go at 60mph+. Anything less, the DPF just amasses crud.

Do the I-dtec's work well with a DPF delete etc?

This depends on which outfit/cowboys are used to undertake such a task

 

[Black Pearl UK]

Looks like my next car will be petrol then

 

[TheDarkKnight]

Nothing wrong with petrol at all.

A change in my work meant I couldnt justify keeping my last 4th Gen CR-V 2.2 i-DTEC.

And now with the 1.5T, the advancement of petrol engine tech and higher quality fuels, I can get and beat diesel-like MPGs for fun.

 

[UK-Kev]

What happens if you ignore your cars DPF warning lights - If the DPF is not able to regenerate and the PM level fills to over 90% or 45g, the DPF will need replacing. And when fitting a new DPF, the ECU must be reset to ensure that the ECU knows that the DPF and all related sensors are reset to empty.

I have posted below pdf before, perhaps one of the moderators could make it a sticky in the diesel section.

 

[TheDarkKnight]

I have posted below pdf before, perhaps one of the moderators could make it a sticky in the diesel section.

Please start a new thread - then I will stick it for you

 

[Smokingman]

Had similar on my MK8 Accord, two regens at Honda then they then wanted to replace at £1600. Took to a Indi Honda who removed DPF had it chemically cleaned and refitted and offered lifetime warrante . Good for 56k miles before car written off.