What are the symptoms?

My car has CEL but seems to run perfectly fine. Had the codes rest but the CEL came back real quick...

 

First symptoms are when you are driving hard the car basically shuts down for an instant...then about 30 seconds later you get ABS/PSM lights...then about 30 seconds later you get CEL. If the MAF is blown, I believe there is no way to "fix" it, so resetting the CEL will only work temporarily. The car will run fine (although there may be top end limit on boost...kind of a limp mode...not sure here). Oh yeah, I just blew another one myself yesterday. Actually I took mine out today and no limp what so ever..full 1.2-1.2 boost..go figure?

 

Ari scan the code first but if your PSM/ABS lights come on then it's your MAF. Otherwise it's something else...

 

No PSM/ABS lights.....

I'll scan codes and report back.

 

If your MAF is blown, your intake temperature as reported by an OBD 2 reader will show -40 and you will not show any reading for air flow.

 

My intake temp read accurately when my MAF was bad. The car ran too lean under full power, fuel trims were high. It seemed to run perfectly at low loads.

 

My intake temp would also read fine but air flow reading would not register. Mine would studder and buck at low loads, but run pretty good at high RMP. I would als get STFT1 looking wacky and STFT2, LTFT1 & LTFT2 all at 0.

Ebaker, maybe different readers see things different? ie. Intake temp? (ebaker and I both use Pocket Logger)

 

Just had my second one go bad yesterday. Hopped in today and the codes were gone. I know it's going though.

 

Sorry to hijack but I just got a CEL yesterday........everytime I start the engine it turns on......took it to my local guy today and he pulled the code and it was a PO 1130 fuel control meter......correct me if I am wrong but that's my MAF right? And I do NOT have a ABS/PSM light.....guess I will try cleaning it first.....cause the car runs fine.....and I see max boost 4 or 5 times a day.....

Chris

 

Here is what I've seen:

P1130 Oxygen sensing adaptation, idle range, bank 2
If P1128 or P1130 (oxygen sensing at rich threshold) is stored in the memory, this means that the fuel/air mixture is too lean.
Air leaks ahead of the oxygen sensors can lead to a fault in adaptation. Check exhaust system for leaks. Check for air leaks in intake air system. Maybe O2 sensor.

Another person replaced the MAF and all was good again....so go figure.

 

2469 P1130

0-117

page 2

p1130
Printed in Germany – 4, 2002

361 Oxygen Sensing Adaptation, Idle Range, Bank 2 -
Above Limit

Diagnosis conditions

•

Oxygen sensing system active

•

Time elapsed after engine start-up: 250 to 350 seconds (USA)

•

Time elapsed after engine start-up: 302 to 402 seconds (RoW)

•

Engine temperature greater than 60 °C

Possible fault cause

Incorrect signal from MAF sensor

Intake air system leaking

Fuel pressure too low

Volume supply of fuel pump too low

Fuel injectors fouled
PCV valve leaks

Cap of oil filler neck not closed correctly or seal is damaged

Affected terminals

-

Diagnosis/Troubleshooting

Air leaks ahead of the oxygen sensors can lead to a fault in adaptation
Check exhaust system for leaks.

Contrary adaptation values in connection with misfiring point to incorrectly adjusted control times
check control
times and adjust if necessary.

If the fuel tank reserve light is switched on, no fault is entered.

Work instruction Display OK If not OK

1 Close cap of oil filler neck
properly or replace the
seal
2 Check signal from MAF
sensor.

Connect special tool 9637.

Measure voltage at pin III/23
and ground

Switch on the ignition.
0.9 to 1.1 V. Replace MAF sensor

Start the engine. Approx. 1,4 V
3 Check exhaust system for
leaks
4 Check for air leaks in
intake air system
5 Check PCV valve for leaks
6 Check fuel pressure
7 Check volume supply of
fuel pump
8 Fuel injectors fouled If preceding Check Points were
negative, the fuel injectors may
be fouled

Clean fuel injectors (ultrasonic
cleaning device) or replace them

Note!

 

Ari - did you ever figure out the problem. I installed a Evo-vflow and its seems every 250miles i get the code P1128 and P1130. I know its the vflow becuase this never happend before the install. I checked all connections and everything is pretty tight. Only air leak point i see is the back tube, behind the wall and air filter. Just wanted your input or anyone else. Thanks.

keith

 

I had similar problems when I put in my AP exhaust and Evo Intake. Sharky changed the O2 sensors and MAF and the problem never came back.

 

The 2 bolts behind the vflow were lose. I reset the error code and wait to see if it comes back. If it does im going to replace the MAF. Wish me luck! Thanks.

 

P1128
360 Oxygen Sensing Adaptation, Idle Range, Bank 1 - Below Limit

Diagnosis conditions

• Oxygen sensing system active
• Time elapsed after engine start-up: 250 to 350 seconds (USA)
• Time elapsed after engine start-up: 302 to 402 seconds (RoW)
• Engine temperature greater than 60 °C

Possible fault cause

• Incorrect signal from MAF sensor
• Fuel pressure too high
• Fuel injector leaking
• EVAP canister purge valve open