kingkhan
Member
Problem: EML, late gear changes, jerking, no power. Realised my plug had unplugged itself from the sensor. But after refitting there was still a problem.
Ok so i fitted a new exhaust back pressure sensor (EBPS) but the engine is still throwing this fault p047128. If i drive it after clearing the fault the sensor readings are perfect and car is back to 100% but when the engine is turned off, after exactly 1minute the EBPS jumps to 2bar and the fault returns and car is back to limpmode. I have tried 3 sensors including original..all doing the same thing. All dpf readings and pressures are fine, car drives perfect until the car is turned off .
I Tried fo find info all over the net about this but no answers! It taken me many hours to fix this issue.
So just for your info, the sensor has a small pinhole which pushes air out into the plug (yea the plug connector! which also has vent hole). This then gives a reading. Also if it shows 2bar then unolug the sensor while car is running then plug back it and it will return pressure back to 1bar.
FIX: pull back the connector from sensor a tiny bit whilst its plugged in. do not push it down as far as it goes because there needs to be a gap between the 2 tiny holes (one on the sensor and one on the plug that measures the pressure reading). I used some silicone spray on the rubber watertight seal of the plug to make the plug side on easily otherwise it needs a tight push which ends up being pushed down too far. Best way to do it it push it until you feel a clip then pul back on the plug. If you have live data, turn the car off and watch it. If the pressure stays at about 1.01-1.1bar then your problem is sorted. If it jumps to 2.0bar you need to fiddle with the plug
Ok so i fitted a new exhaust back pressure sensor (EBPS) but the engine is still throwing this fault p047128. If i drive it after clearing the fault the sensor readings are perfect and car is back to 100% but when the engine is turned off, after exactly 1minute the EBPS jumps to 2bar and the fault returns and car is back to limpmode. I have tried 3 sensors including original..all doing the same thing. All dpf readings and pressures are fine, car drives perfect until the car is turned off .
I Tried fo find info all over the net about this but no answers! It taken me many hours to fix this issue.
So just for your info, the sensor has a small pinhole which pushes air out into the plug (yea the plug connector! which also has vent hole). This then gives a reading. Also if it shows 2bar then unolug the sensor while car is running then plug back it and it will return pressure back to 1bar.
FIX: pull back the connector from sensor a tiny bit whilst its plugged in. do not push it down as far as it goes because there needs to be a gap between the 2 tiny holes (one on the sensor and one on the plug that measures the pressure reading). I used some silicone spray on the rubber watertight seal of the plug to make the plug side on easily otherwise it needs a tight push which ends up being pushed down too far. Best way to do it it push it until you feel a clip then pul back on the plug. If you have live data, turn the car off and watch it. If the pressure stays at about 1.01-1.1bar then your problem is sorted. If it jumps to 2.0bar you need to fiddle with the plug
