I need some advice. I've been getting a single code, P0103 (2012 boxer 2.2l) intermittently for the last month or so. I've been trying to resolve the problem but I'm rapidly running out of ideas.
Symptoms happen very intermittingly, sometimes once an hour, sometimes twice in 10 mins.
40% of the time I'll get the engine management light on, a few times this also resulted in limp home mode until the error was cleared.
60% you'll just see the error in the ODB reader with no limp home mode or engine light on
What I've replaced
What I've checked
What I've checked with the engine running while watching the MAF live readings, trying to (unsuccessfully) generate the error.
Symptoms happen very intermittingly, sometimes once an hour, sometimes twice in 10 mins.
40% of the time I'll get the engine management light on, a few times this also resulted in limp home mode until the error was cleared.
60% you'll just see the error in the ODB reader with no limp home mode or engine light on
What I've replaced
- New MAF sensor
- Soldered in a new MAF sensor connector
- New O2 sensor
- New alternator (Was due for replacement anyway)
- Added a second earth strap direct from battery to engine
- New rear number plate light housing( it was pretty crusty looking and they can apparently cause MAF issues because they share the same circuit)
- New Air filter (Was due for replacement anyway)
What I've checked
- There don't appear to be any air leaks around the air filter housing
- Original Engine earth strap was replaced last year
- There does not appear to be any damage to the cabling from MAF to ECU
- The MAF cable is not routed near anything electrical until it gets to the ECU
- Both MAP & MAF appear to show normal reading while at idle and getting revved
What I've checked with the engine running while watching the MAF live readings, trying to (unsuccessfully) generate the error.
- Shaking/bending the MAF sensor and its cable back to the ECU
- Shaking/bending the MAP sensor and its cable back to the ECU
- Shaking/bending the Water in Diesel sensor and its cable back to the ECU (shares circuit with rear number plate and MAF)
- Shaking/bending the ECU's earth cables behind the front bumper
- Cleaning and reseating the Connectors into the ECU
- Shaking the cables going into the BSi
- Shaking the ECU
- Removing the MAF from it's housing creates a significant drop in readings but no errors.
