P38A Error code P0112

Andy Burrell · Mar 25, 2022

4.6 petrol.
I am getting a persistent error code P0112 which points to the air temp sensor in the MAF. I have checked for air leaks in the induction pipe and that's all OK. I have cleaned the connector with switch cleaner no difference. If I take the air box cover off and just rev the engine the code doesn't re appear. If I put it back its straight away back.
Is there anyway of testing the sensor with a multimeter?
If it is knackered are the cheaper replacements any good or do I need to get a genuine Bosch one?

kermit_rr · Mar 25, 2022

Could you be nudging a connection/wire somewhere? Genuine MAF seems to be the way to go, they are quite fussy

Andy Burrell · Mar 25, 2022

kermit_rr said:
Could you be nudging a connection/wire somewhere? Genuine MAF seems to be the way to go, they are quite fussy

I did wonder that, but guess where the wire disappears, under the upper manifold
It seems to run OK, no errors on the dash etc. Needs a new air filter which I will pick up tomorrow. I have got the gas running better, not 100% but very drivable. Plug colours are all golden so mixture can't be far off.

DanClarke · Mar 25, 2022

I think you can check the MAF values according to RPM with the Nanocom to know if your MAF is stuffed or not.
Although as @kermit_rr points out dodgy wiring will affect the values the NANOCOM reports too.

Datatek · Mar 25, 2022

Andy Burrell said:
4.6 petrol.
I am getting a persistent error code P0112 which points to the air temp sensor in the MAF. I have checked for air leaks in the induction pipe and that's all OK. I have cleaned the connector with switch cleaner no difference. If I take the air box cover off and just rev the engine the code doesn't re appear. If I put it back its straight away back.
Is there anyway of testing the sensor with a multimeter?
If it is knackered are the cheaper replacements any good or do I need to get a genuine Bosch one?

If it's OK with the airbox cover off, could it be that the air filter is blocked?

Andy Burrell · Mar 25, 2022

Datatek said:
If it's OK with the airbox cover off, could it be that the air filter is blocked?

The one that's in there is a grubby unipart one so not been changed for a while. Getting one from Euro Car Tarts in the morning.

Datatek · Mar 25, 2022

Andy Burrell said:
The one that's in there is a grubby unipart one so not been changed for a while. Getting one from Euro Car Tarts in the morning.

Try running without the air filter

Andy Burrell · Mar 25, 2022

Also looking at it more closely its a cheap pattern one on there so it's probably the issue.

Grrrrrr · Mar 25, 2022

Andy Burrell said:
Also looking at it more closely its a cheap pattern one on there so it's probably the issue.

If not, try unplugging the MAF and see if it runs better.

Mark Piercy · Mar 28, 2022

I'd check the filter box where the air also enters, mice can build a great nest that can course issues like this also. I've had a Honda civic 1.6 idic' diesel in with an air/fuel mixture sensor fault....

why would that be???

JUKE179r · Mar 28, 2022

Sounds like a bad MAF. Always replace with a Bosch brand.

Datatek · Mar 28, 2022

Mark Piercy said:
I'd check the filter box where the air also enters, mice can build a great nest that can course issues like this also. I've had a Honda civic 1.6 idic' diesel in with an air/fuel mixture sensor fault....
View attachment 261954why would that be???

Looks like it's had regular dealer servicing

Mark Piercy · Mar 28, 2022

Datatek said:
Looks like it's had regular dealer servicing

Funny you should say that... They had bought it from a car dealer who had serviced it.... The oil filter (after being driven from England) was loose if they skimp on an air filter what else could be a foot!!!

Andy Burrell · Mar 30, 2022

So have checked all the intake for blockages but all clear, new air filter fitted and a known good MAF as well. Unfortunately the issue still exists so looks like a wire somewhere in the loom is busted. Just got to work out where the wires go now.

P38A Error code P0112

Andy Burrell

Retired to the country

kermit_rr

Very

Andy Burrell

Retired to the country

DanClarke

Well-Known Member

Datatek

Well-Known Member

Andy Burrell

Retired to the country

Datatek

Well-Known Member

Andy Burrell

Retired to the country

Grrrrrr

Technician, Bodgit & Scarper Ltd

Mark Piercy

Well fumbled member....

JUKE179r

Well-Known Member

Datatek

Well-Known Member

Mark Piercy

Well fumbled member....

Andy Burrell

Retired to the country

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