Hi,

I bought a 2008 C Max 3 weeks ago. Mileage 126,000. The guy said he hadn't used it much during lockdown. When I put fuel in it, it took a while for the fuel gauge to move. OH plugged it in before the drive home and it said fuel pressure sensor code, but the gauge gradually came up as we were discussing the car. I noticed exhaust fumes filling the cabin on the 2 hour drive home. Tried to get DPF to regen manually and then took to a garage to force it. Neither worked. Then Engine Management light came on. Codes said DPF was at fault.

On Saturday I fitted a brand new DPF and took it for a short run to enable the car to register its replacement. All codes were cleared. Haven't used the car until this evening. Took it for a spin out on the bypass (I live less than 1/4 mile from it). By the time I got to the next slip road, temp was up where it usually is, had a brief smell of rotten eggs then Amber engine light came on. No rough engine, spluttering or anything obvious.

Before replacing the DPF I filled the additive tank with 1 litre of additive as I thought it may never have been topped up (supposed to be every 70,000 miles) so thought that's why it wasn't regenning.

After replacing, I made the mistake of pressure washing the engine gently (far away) as I was washing the car and it was full of leaves and cobwebs. I have read on a thread on this site that someone else pressure washed the engine bay and had similar smell and warning light but as engine dried out it sorted itself out.

I have a few questions. Would a new DPF make that smell and trigger the Amber light until its had a long run in order to start working properly? Could it be because I got the engine wet? Would the Lambda sensor cause that smell or could it still be the fuel sensor playing up? I'm going to plug the car in over the weekend to get codes but wondered if this is normal when a DPF is replaced.