wwboater

Could a hole in the oil separator breather hose cause fault codes p1124 and p1126? I have cleaned the Maf and still get the codes and rough idle. I noticed that I have a hole in this line because it has been rubbing on the intake system.

Thanks

Seeeu911

I have those same 2 codes and a leak in the AOS bellows.....plus a oil leak.

Tippy

To tell if you have a hole in the oil separator, remove the oil cap and see if the engine runs rough or dies. Also, place your hand over the filler tube opening and see if there is a strong vacuum pull. If you have the symptoms, the diaphram has cracked or ruptured.

wross996tt

P1124 167 Fuel pump relay output stage - below limit
Possible fault cause:
♦ Fuel pump relay
♦ Short circuit to ground
♦ DME control module

P1126 356 Oxygen Sensing Adaptation, Lower Load Range,
Bank 1 - Below Limit
Possible fault cause:
♦ Incorrect signal from MAF sensor
♦ Fuel pressure too high
♦ Fuel injector leaking

1999Porsche911

Here are the correct indications:

P1124
Oxygen Sensing Adaptation Area 1 (Cylinders 1 - 3) - Rich Threshold

P1126
Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold



You are running lean on both banks which could be caused by intake leak, wrong MAF signal, vacuum leak, bad plugs, low fuel pressure, leak in exhaust system, fouled injectors and other possabilities.

The errors are generated at idle.

wross996tt

hmmmm...those codes are right out of the workshop manual? This is DME 7.8.

Also same info as I posted from Renntech RennTech P1124

P1124 167 Fuel pump relay output stage - Below Limit, 167 Fuel pump relay output stage - Above Limit, 167 Fuel pump relay output stage - Open circuit

wwboater

Well since the car was just purchased the dealer is taking car of this problem. So when I get it back I will let you all know what he did to fix it. Thanks for the advice...

Tippy

With those codes, I bet that the MAF is dead causing a lean condition.

According to 2 mechs and 2 service advisors, anytime they get 02 issues, it is always the MAF that is dead and the OBD II thinks it is the 02 sensors that are the issue since the 02 sensors will below min value. This was the case with my car.

1999Porsche911

The computer DOES NOT think the problem is with the O2 sensors. It is simply reporting that the sensors are working properly and that you have a lean condition in the exhaust of both banks. Cause could be any of a dozen number of things or combination of them. Any problem that allows more air into the engine or to the O2 sensors that is not reported to the computer or any problem that allows for less fuel to be delivered than the engine calls for.

wwboater

I changed the MAF out with a new one and it did not fix the problem. So now I have a new MAF for sale. Any takers?

Tippy

How much?

Tippy

Ok, based on what you said, it is a lean condition. 2 mechs and 2 service advisors told me that the MAF dying would cause codes from the 02 sensors If the 02 sensors are dead or simply out of range. Apparantly, the OPs MAF was not the case. But to others who have these issues, I have been chasing a similar lean condition for a week now and that is the reason I stated the MAF may be a possible cause. I will know tomorrow.

wwboater

$250 shipped to your door.

1999Porsche911

For the price you paid for the MAF, you could have purchased a scanner or scanning software for your PC. Why diagnose blind when there are the tools available for you to see?

1999Porsche911

If you have a scanner, take a look at your MAF readings at idle. That will tell you if it is bad or not.