P0103 Mass or Volume Air Flow Circuit A High -- HELP

jonnymac · Jul 3, 2023

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

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.

Any help or suggestions would be greatly appreciated

RedSector · Jul 4, 2023

Ok so my guess here appears a right variant, ECU pictured is a SID 208. There were few 2.2 HDi with this controller but from a quick glance the wiring appears the same, and they all have a temp sensor integrated in the flow meter or that is what Haynes Pro claims.

jonnymac · Jul 4, 2023

Its very possible I'm wrong, I thought the MAF with 4 cables didn't include the temperature sensor.
It looks something like this

I can check later when i get home, I did take a pic of the ECU when i was checking the connectors if thats any use

RedSector · Jul 4, 2023

Interesting, just check all 2.2 HDi variants, and they all have temperature sensor integrated.
There are two variants that use ECU: Visteon, DCU102
Any chance your code reader might be able to provide the ECU and the ABS/TC

jonnymac · Jul 4, 2023

Thanks for the help RedSector.
The MAF I have doesn't have a temperature sensor but I should be able to trace the wires back and use the information you kindly provided to test the resistance on wiring I have

RedSector · Jul 4, 2023

Here, let's have a go on a guess... If testing does not work to the right pin outs (picked wrong engine/ecu) or points toward another module (can provide the additional testing)

PEUGEOT Boxer III 2.2 HDi 110 PUMA C (4HG) 2011 - Onwards (without start/stop)
ECU: SID 208
ABS/SC: Bosch 9.0
Engine output: 81 Kw

DTC P0103 Mass airflow meter 1 circuit high
Possible components or wiring involved.

(1) Mass airflow meter with air temperature sensor.

RedSector · Jul 4, 2023

Ok, do you know kw output of the engine ?
Do you know the ECU and/or ABS make?
Does it have start/stop functions ?

Vans are a pain to get the right information for engine designation, the VIN parts 6,7,8 works on most of Peugeot vehicles from the VIN but not commercial/van ones.
The issue is there are fair few possibilities for 2.2 and want to make sure information is directly related to the right variant of engine, ecu/abs, you have to minimise error(s) in that information.

Only one that de-cricripted part of it was
VIN Decoder | Checker | Free Vin Check | Search VIN number (vin-decoder.com)

jonnymac · Jul 3, 2023

I tried putting the VIN number into a few decoder websites but it didn't provide anything very useful. VF3YCTMFC12297600

RedSector · Jul 3, 2023

Try here

RedSector · Jul 3, 2023

What is the engine designation code ? possibly 4HH, 4HG, 4HJ, 4HU or something else.

jonnymac · Jul 3, 2023

That's a question I sadly can't find the answer to, I don't see anything like that in the VIN or stamped around the engine bay.

P0103 Mass or Volume Air Flow Circuit A High -- HELP

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