I finally got my error codes from DIS, here's what it picked up before I reset them:
- ASC-41: Wheel Speed Sensor, Rear Right, Control Not Active
- ASC-31: Wheel Speed Sensor, Rear Left, Control Not Active
- DDE-08: Glow Plug System. Duration Relays Faulty. Sporadic
- DDE-06: Exhaust Gas Recirculation. Pos. Deviation/Air Mass 50mg/Stroke Too Low
Control, Exhaust Gas Recirculation. B1361_D3AGR
Charging Pressure Sensor B1361_D3LDF
1A MRS: Seat Occupancy Recognition
1F LSZ: Activ'n, Motor For Headlight
20 LSZ: Activ'n, Motor For Headlight
I then reset them and drove for 5 minutes and re-read the codes:
- 08 DDE Glow Plug System. Duration Relay Faulty. Currently Not Present
1 at Engine Speed 188.0 rpm
1 at Coolant Temp 12 oC
1 before Op. Hours 25.7 h
Last at Engine Speed 25.7 rpm
Fault Frequency 50
I have been having problems with no power at low revs and only managing 28mpg around town so have done all the filters including crankcase breather, fitted a decatted front exhaust pipe, blanked the EGR, placed some injector cleaner in fuel, cleaned MAF with CNC MAF cleaner and changed the oil.
I'm guessing one of those errors was because I unplugged the MAF during cleaning? I read that such an error may not be the MAF so today I double checked for leaks by getting my gas bottle and torch out (for roofing) and blasted the engine bay with propane whilst running. No idle change.
Further reading on MPG issues suggest it may not be getting up to temperature so I did the EGR thermostat test by blowing through it and I can breathe through it, quite easily but there is some restriction. I'm fairly sure it isn't the the main thermostat as the car get's to 90c+ within 10 minutes driving. Dashboard needle takes around 10+ minutes to get to 12oclock.
Soooo, I was quite surprised to see a glow plug error. Can anybody advise me how to diagnose this error? I have a multimeter but will need lots of guidance if it's needed! I'm not a mechanic, just an enthusiastic E46 owner
Also, can anybody explain the other codes I received before the reset? I didn't think my car had seat occupancy sensor, and the headlights seem to adjust fine. The ASC seems to working fine also so I wonder of the fault codes maybe weren't reset after the rear sensors were replaced. Is this common?
Any help would be much appreciated as always.
E46 320d Touring 2001 (Y)