Codes P1124, P1126, P0130

[strawfordt]

Hello All,

I did a new MAF sensor before putting my 98 Boxster away last year. I drove 190 kms in the last two days and bingo, I got a CEL.

I checked and the codes are

• P1124
  
• P1126
  
• P0130
  

I am running fine but I better get a handle on this. Can anyone help with the interpretation of the codes?

Also, What does an oil change and new filter usually cost from the stealer? Any ideas? My local guy is charging me $250.00 for the filter and oil change.

Thanks for all the help here. This forum is way better than some of tthe forums for my other vehicles.

Tom

[Loren]

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

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

This means that your mixture is running too lean - that is, the DME can not make the mixture rich enough to compensate for additional air.

Potential fault areas:

- Intake air system leaking.

- Fuel pressure too low.

- Volume supply of fuel pump too low.

- Fuel injectors fouled.

A really bad MAF reading can cause this as well as intake leaks (cracked oil filler tube, AOS, etc., etc.)

P0130 Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Intercore Short Circuit or Limited Voltage Increase

- Oxygen sensor

- Wiring harness

- DME control module

This sensor needs to be checked to see if it is cracked (ceramic) or if the wires are damaged.

[strawfordt]

Wow Loren,

Very fast and insightful, thanks. Can you shed some light on a DME and what it is? I smell big bucks coming down the pipe to fix this one. Getting frightened here in Windsor.

Thanks again.

[Loren]

There are many things it could be before your DME (Engine Computer).

You should find a shop with some test equipment like the Durametric Software, a PST2, or PIWIS tester and have them look at your air flow (MAF reading).

And, as I said check for damage on that one sensor - it is fairly common to have mice (or other rodents) eat away the insulation on wires during storage. We've seen and heard it it here many times.

[strawfordt]

Loren,

For the below issue, could it be my charcoal cannister valve stuck open thereby lowering the fuel pressure?

What do you think? I am running fine but still trying to fix these codes without going to the dealer which is a long way away.

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

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

This means that your mixture is running too lean - that is, the DME can not make the mixture rich enough to compensate for additional air.

Potential fault areas:

- Intake air system leaking.

- Fuel pressure too low.

- Volume supply of fuel pump too low.

- Fuel injectors fouled.

[Loren]

Loren,

For the below issue, could it be my charcoal cannister valve stuck open thereby lowering the fuel pressure?

What do you think? I am running fine but still trying to fix these codes without going to the dealer which is a long way away.

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

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

This means that your mixture is running too lean - that is, the DME can not make the mixture rich enough to compensate for additional air.

Potential fault areas:

- Intake air system leaking.

- Fuel pressure too low.

- Volume supply of fuel pump too low.

- Fuel injectors fouled.

Clear the codes - if they come back you do have a problem.

You also may need to see what your MAF is doing - if it is bad it might give erroneous air flow readings.

[ericinboca]

Loren,

For the below issue, could it be my charcoal cannister valve stuck open thereby lowering the fuel pressure?

What do you think? I am running fine but still trying to fix these codes without going to the dealer which is a long way away.

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

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

This means that your mixture is running too lean - that is, the DME can not make the mixture rich enough to compensate for additional air.

Potential fault areas:

- Intake air system leaking.

- Fuel pressure too low.

- Volume supply of fuel pump too low.

- Fuel injectors fouled.

I don't know the answer to the question on the charcoal filter, but I think your most likely culprit is at the air intake. Be sure you look at all the big tubes at the top of your engine - the air intake tubes. If it has been in storage, these might have cracks in them, letting too much air - or maybe temperature changes have made them expand and contract to the point there they are not overlapping properly and there is a gap.

The 02 sensor screws into your exhaust header before the catalytic convertor. Your fault read out is saying the problem on is on the passenger side. Look to be sure the wires are all still intact; be sure it is still plugged in tightly. You can unplug and unscrew it and test for continuity, etc. if the wiring looks OK. There are some posts about testing the sensor. New ones are $140 or so - Sunset will have them cheaper, and you can get aftermarket ones that are universal (and cheaper) but you have to cut the old connector off and wire it to the universal one.

Chances are nothing is wrong with your DME.

$250 for an oil and filter change seems high to me. Mobil 1 retails at about $7 a quart, you need a little more than 9 quarts - the Porsche recommended filters are $10 - $15, and the oil drain plug is $1.50. It is a simple DIY and Loren has instructions posted.