[Carbonman]

Hi folks,

I am new to the forum but came here needing help which I found. I have a mates S40 2.0D with what was a intermittent limp home mode.

After having the ECU codes read I had the same codes:

ECM2454 - Pressure sensor particulate trap sensor signal too low
ECM2002 - Particulate trap faulty signal
ECM2452 - Pressure sensor particulate trap faulty signal

All these point to the DPF pressure sensor being faulty. I went to my local Volvo dealer (cheaper than Ford) for price and availability of the sensor
volvo part number is 30757189 for the sensor. as advised earlier. Parts dept advised that Volvo list a modified pipe for this car (part no: 30750461) and that they will supply them, but if the pipes are not required then I could return them. So I came away with both parts in hand.

I fitted the sensor which is as advised is located on the side of the battery box. I took it for a test drive and initially it was still in limp home mode. I stop during the drive and restarted, this time it was all working fine revving past the 2800rpm. Drove for a while longer and it returned to limp home mode. A bit freaked that I had replaced the sensor and it worked only for a short time.

Just been back at the car today and had a good look under the car. The problem is the hose attached to the metal pipe just before the DPF filter is blown wide open see the second attachment.

I cant tell the where the modification is on the pipes but they were needed anyway. Regardless, changing the pipes is fiddly but still fairly easy to do. I used car ramps to have full access to the DPF filter and the route it follows up the bulkhead to the sensor. It is mounted on the upside of the floor pan by a ribbed screw type pin. I eased it of with a long lever.Unclip it from the plastic clip just down from the sensor. The pipe does not come down the way it has to be pulled up the side of the battery box pull it up and twist it through the gap (thats the fiddly part).

I took the car for a second test drive but again it was still in limp home mode, I kept driving for a few miles, stopped the car, restarted and it revved fully through to above 3700rpm.

Moral of this story is I should have checked the full length of the pipes especially down at the DPF filter which is just about middle of the car. Maybe it did not need the sensor, just the pipes, but my mates just happy to have his car back running again.

I don`t know if this will help anyone else but I thought I would share it since I learned from this forum, where to start.

Good Luck with your own car should you need to do it. Don`t be frightened to tackle it yourself, it can be done with basic knowledge a pair of pliers and a long lever.

Price for parts:

Modified pipes £107.40 inc vat

Sensor £93.60 inc vat £201 total