GRRRR. My daughter's polo is playing up. This is annoying me because she is annoying me about it!
History - it was fine yesterday, until I used it to test my OBD scanner. I disconnected the lambda sensor to generate a fault, then plugged it back in and cleared the codes. I did check for pending codes too before clearing, there weren't any.
Today it was idling poorly, and she says it's down on power so I checked it again - MIL off, no stored codes, no pending codes. I reset it again (making sure there was no pedal input while it recalibrated) and it seemed to be ok. She set off back to uni (hull!) but rang me around 20 miles from her destination saying that it was running really badly, and both the MIL and EPC lights are on. She is calling the RAC and I'll have to go down tomorrow and sort it out.
Major headache here is that as she sees it, it was fine until I touched it ergo it is my fault. I'm fairly sure that the code read and clear didn't do this (at least, not directly) but until I see the codes it has recorded, I don't know.
I have a theory though. I've noticed (and she has complained) that sometimes there is an odd stutter when accelerating but it hasn't been an issue and never threw up a trouble code. Google suggests that the throttle pedal sensor (built into the top of the pedal) is made of cheese on these so I suspect that this is faulty, and my code clear removed the base setting which it can't now get back because the pedal is faulty. This would explain why it was managing to run until I reset it.
Does this sound likely? I'm packing scantools, oscilloscope and mobile internet for tomorrow!
History - it was fine yesterday, until I used it to test my OBD scanner. I disconnected the lambda sensor to generate a fault, then plugged it back in and cleared the codes. I did check for pending codes too before clearing, there weren't any.
Today it was idling poorly, and she says it's down on power so I checked it again - MIL off, no stored codes, no pending codes. I reset it again (making sure there was no pedal input while it recalibrated) and it seemed to be ok. She set off back to uni (hull!) but rang me around 20 miles from her destination saying that it was running really badly, and both the MIL and EPC lights are on. She is calling the RAC and I'll have to go down tomorrow and sort it out.
Major headache here is that as she sees it, it was fine until I touched it ergo it is my fault. I'm fairly sure that the code read and clear didn't do this (at least, not directly) but until I see the codes it has recorded, I don't know.
I have a theory though. I've noticed (and she has complained) that sometimes there is an odd stutter when accelerating but it hasn't been an issue and never threw up a trouble code. Google suggests that the throttle pedal sensor (built into the top of the pedal) is made of cheese on these so I suspect that this is faulty, and my code clear removed the base setting which it can't now get back because the pedal is faulty. This would explain why it was managing to run until I reset it.
Does this sound likely? I'm packing scantools, oscilloscope and mobile internet for tomorrow!
