Blocked DPF warning but new DPF has just been dealer fitted

[Muldoonsghost]

Good afternoon folks.

2013 (Mk4) Honda CRV, 2.2 iDTEC diesel, manual. 93k.

I've owned this car for a year and a bit. Bought privately, so no comeback. It has shown the fully blocked symbol several times since it was purchased and I have had the following done.

1. Forced regeneration by Honda main dealer. Error cleared for a few months.

2. Cleaned by chemical spray and a 'Hydrogen clean' performed by a local independent. Error cleared for a few weeks.

3. DPF removed, washed in a 'state of the art DPF cleaning machine the new DCS-20' Error not cleared, still in limp mode. A large non dealer garage.

4. DPF filter and sensor replaced with new by my local Honda Main Dealer. £3000 spent with them, STILL IN LIMP MODE! (Also they broke a glow plug while trying to do a compression test and left it broken.)

In all cases no one has found an error code. Honda did say one of the injectors was 'imbalanced'. I can only guess they meant partially blocked.

I have since removed the pipe that the soot sensor uses and it seems unblocked. I can put a wire inside it all the way to the DPF and it comes out almost clean. I squirted a load of EGR cleaner down it to make sure anyway. Terminals and wiring on the sensor look OK. What's left? If I can't get this light off and out of limp mode it won't pass it's next MOT so will become scrap. Otherwise this is a great car, clean, undamaged, economical. Can anyone advise what else I can look at?

Thanks.

[Muldoonsghost]

How u doing said:

Did they just hand it back like that?

Yes and no. They were trying to diagnose the problem, and they charge per hour of course. So it was £2200 for the DFP, plus fitting. £2500. Then it refused to regenerate, so they did code checks. none. Then they supposedly spent half a day working with Honda UK sending them telemetry trying to find out what was telling the ECU that there was a problem. They were going to try swapping an ECU with a car in stock but allegedly Honda UK wanted to rule out an actual engine problem so they wanted to do a compression check. Bear in mind, each stage is being charged. The 'Senior Technician' has never had a problem he can't solve. So I say OK, do a compression check. That's where the glow plug comes in to it. He allegedly 'found' a damaged plug and now it shows a new error code. Obviously, in hindsight, he broke it.

So I'm no nearer finding the problem. And now the engine is starting to miss on one cylinder even in limp mode. They're all missing SOMETHING but I don't know what. Considering selling on ebay just to get a little cash back.

[Muldoonsghost]

ITS FIXED!

I blew out the pipe between the DPF and the sensor with air and the error just went away. So much money wasted. As for the glow plug its getting repaired by a specialist and the bill will go back to Honda via a solicitor.

Thanks for all your input, I've learnt a lot.