diego996

Did you let it run for a few minutes? The computer has to adapt to actually getting a signal from the MAF

I did and it didn't get any better. I was able to return it and get a full refund from Autohaus AZ. I then ordered the correct MAF from Pelican Parts. Installed it Wednesday and cleared the CEL. Drove the car to let the monitors run and now I have no more CEL. It would seem to be fixed. So the advice on this site was spot on. Thanks everyone! :D

Today I received a new MAF from Autohaus Arizona with part number 986.606.125. Is this interchangeable with my old one with part no. 996.606.124?? or do I have the incorrect one. I haven't tried it yet...

Sorry, your car needs a 996.606.124.00.

I did notice on the Pelican site that the other part number was specified for a '02-'04 C2/C4. I was surprised since the part number started with 986?

Actually the MAF for MY02 and newer is a 986 number.

I contacted the folks at Autohaus AZ this AM, and the rep said according to Bosch they are interchangeable. Do you think there is any harm in trying it out?

Good Luck!

Let us know if it works...

Well, it didn't...at least not very smoothly. I let it run until the idle dropped, then blipped the throttle. It would have died had I not kept my foot on the pedal. So I swapped the old one back in...much better. Not ideal, however it'll work for now. In the meantime, I am attempting to exchange for the correct part.

Today I received a new MAF from Autohaus Arizona with part number 986.606.125. Is this interchangeable with my old one with part no. 996.606.124?? or do I have the incorrect one. I haven't tried it yet...

Sorry, your car needs a 996.606.124.00.

I did notice on the Pelican site that the other part number was specified for a '02-'04 C2/C4. I was surprised since the part number started with 986?

Actually the MAF for MY02 and newer is a 986 number.

I contacted the folks at Autohaus AZ this AM, and the rep said according to Bosch they are interchangeable. Do you think there is any harm in trying it out?

Today I received a new MAF from Autohaus Arizona with part number 986.606.125. Is this interchangeable with my old one with part no. 996.606.124?? or do I have the incorrect one. I haven't tried it yet...

Sorry, your car needs a 996.606.124.00.

I did notice on the Pelican site that the other part number was specified for a '02-'04 C2/C4. I was surprised since the part number started with 986?

Today I received a new MAF from Autohaus Arizona with part number 986.606.125. Is this interchangeable with my old one with part no. 996.606.124?? or do I have the incorrect one. I haven't tried it yet...

Sorry, your car needs a 996.606.124.00.

Thanks, I kinda figured. Back it goes.

Today I received a new MAF from Autohaus Arizona with part number 986.606.125. Is this interchangeable with my old one with part no. 996.606.124?? or do I have the incorrect one. I haven't tried it yet...

2469 P1128 0-116 page 1

p1128

Printed in Germany – 4, 2002

0-116 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

Affected terminals

-

Diagnosis/Troubleshooting

♦ If DTC P0445 (fuel tank vent valve - short to ground) is stored, correct this fault first. An open EVAP canister

purge valve can lead to the lean threshold being reached.

♦ For vehicles in the USA, the upper load range will probably not be reached. The only case in which a fault could

be stored is during driving while towing a trailer or caravan on a hill.

♦ Contrary adaptation values in connection with misfiring point to incorrectly adjusted control timescheck 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 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

2 Check fuel pressure

Note!

DME 7.8 DME 7.8

2469 P1128 0-116 page 2

p1128

0

Printed in Germany – 4, 2002

360 Oxygen Sensing Adaptation, Idle Range, Bank 1 -

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

3 Check fuel pressure regulator,

vacuum connection

and fuel return line

♦ Remove vacuum hose from fuel

pressure regulator

♦ Connect special tool 9103/2 to

vacuum hose

♦ Start the engine.

♦

0.4 - 0.6 bar Check the intake air

system for leaks

and check vacuum

line to fuel pressure

regulator for restrictions.

♦ Check housing of fuel pressure

regulator for damage and deformation

Replace the fuel

pressure regulator if

it is damaged with

the result that the

spring pre-tensioning

is increased

4 Check EVAP canister

purge valve

♦ Disconnect hose from EVAP canister

purge valve to intake system

at EVAP canister purge

valve

♦ Remove connector of EVAP canister

purge valve

♦ Connect special tool 9160/1 to

EVAP canister purge valve

♦ Generate vacuum of approx. 0.7

bar

The vacuum must

not fall below 0 bar

after 10 minutes

5 Check fuel injectors for

leaks

Work instruction Display OK If not OK

DME 7.8

2469 P1128 0-116 page 3

DME 7.8

p1128

0

Printed in Germany – 4, 2002

♦ 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 timescheck 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!

Has anyone used the special tool 9637 to check the MAF? Where would I find it?

Cleaned mine the other day. What an easy thing to do! It really helped smooth out my idle too.

Got the CR replaced the other day, and took the old one over to a local radiator shop for a pressure test. Sure enough there was a crack below the seam along the outboard side. A visual inspection revealed other cracks but they didn't leak...yet. Hopefully, Porsche got the revised tank right. Thanks to all for informative posts and great DIY information. Knowledge is power!

I did it on my '99 C43 AMG with no problems, however I babied it around until the newer tires broke in a little.

Thanks! What do you think is the best way to inspect the bellows for leaks?

There is no TSB on the Oil Separator - even though these have failed on a number of cars (cracked). The oil separators (there are two) are in the crankcase. To get to them you would need to remove the engine sump cover - and then reseal it after the inspection/repair. In the image below they are numbered 9 and 13 (image is 180 degrees rotated from how it is in the car).

Where in this diagram is the "bellows?" I am confused as to the location and access in my '00C2 6spd.

I saw part no. 996.606.124.00 on Pelican Parts for $252.25 is this the right part? It's made by Bosch, is that OEM?

Yes that is correct.. they are whoring it out at that price :) Cost is $217.10 and Bosch is OEM :)

You will end up finding out it is your MAF :) Promise.

B

Thanks! From what I've read, it sounds like you are probably right. I guess I was hoping these parts would last longer. I have other cars with many more miles that I've never replaced the MAF.

Since I'm getting ONLY 1128 and NOT 1130 could it be the MAF?

My mistake. I am getting both codes, just wasn't forwarding to the second DTC! I guess I will just "bite the bullet" or MAF in this case!!

I saw part no. 996.606.124.00 on Pelican Parts for $252.25 is this the right part? It's made by Bosch, is that OEM?

Yes that is correct.. they are whoring it out at that price :) Cost is $217.10 and Bosch is OEM :)

You will end up finding out it is your MAF :) Promise.

B

Thanks! From what I've read, it sounds like you are probably right. I guess I was hoping these parts would last longer. I have other cars with many more miles that I've never replaced the MAF.

Since I'm getting ONLY 1128 and NOT 1130 could it be the MAF?

I saw part no. 996.606.124.00 on Pelican Parts for $252.25 is this the right part? It's made by Bosch, is that OEM?

Yes that is correct.. they are whoring it out at that price :) Cost is $217.10 and Bosch is OEM :)

You will end up finding out it is your MAF :) Promise.

B

Thanks! From what I've read, it sounds like you are probably right. I guess I was hoping these parts would last longer. I have other cars with many more miles that I've never replaced the MAF.

I just was quoted $435.42 for a MAF for my 00C2 at Sunset Imports...does that sound right?? It's such a small part. I was speechless on the phone!

US MSRP is $652.81 - so that sounds like a good deal to me.

I saw part no. 996.606.124.00 on Pelican Parts for $252.25 is this the right part? It's made by Bosch, is that OEM?

Yes, 996.606.124.00 is correct for MY00 C2

I have only P1128 showing. I've read through the threads on the topic and I'm not ready to "throw in the towel" on air leaks and buy the MAF just yet. So I was wondering if its possible to inspect the bellows without removing the AOS on that side.

I just was quoted $435.42 for a MAF for my 00C2 at Sunset Imports...does that sound right?? It's such a small part. I was speechless on the phone!

US MSRP is $652.81 - so that sounds like a good deal to me.

I saw part no. 996.606.124.00 on Pelican Parts for $252.25 is this the right part? It's made by Bosch, is that OEM?

It felt like the butterfly was under control by the actuator on my e-gas '00C2. Is is OK to use a little force?

I just was quoted $435.42 for a MAF for my 00C2 at Sunset Imports...does that sound right?? It's such a small part. I was speechless on the phone!

:( Took it to Pioneer Porsche in San Diego and it turned out to be the mass air flow sensor or something .... Good news it that $615 later my car runs like a top...

When I spoke with the service tech "Sean Puno" he said :

The part was only $200-$300 but the labor resetting all the computerized air/engine/compression settings was what is so costly...

Along with that they took two post installation test drives and re-adjusted the settings twice for optimum performance.

I asked if it was my crazy driving or possibly the previous owner's fault, think poor upkeep, he said..."Nope, It just goes..." It wasn't you or anyone elses fault....

So then I asked him if I unplug the battery for 5+ minutes, would that turn of the light and/or clear the computer... He said no and that trick only applies to different year models... not my 99'

Paul

Let me know your thoughts... As I said before I am kinda naive as to this stuff.

yeah, I've had other problems with Pioneer and the fellow you mentioned! That's why I love to drive by there and honk after reading how to DIY right here.

instead of loosening the fuel lines, jus slide the reservoir from the reservoir support holder, then remove the support holder. this will give you a lot more room to get the reservoir out

Great point! I also found it easier to just remove the "snorkel" from the AF housing or "airbox" it just slides off and makes plenty of room to access the CR.

99 c2 tip: 68,500. Only real problem was a busted tranny...HOWEVER...I believe it busted due to a mechanic failing to use the recommended fill procedure when I had the tranny service, which resulted in my driving the car for several months with a low fluid condition...toasted the transmission. Other than that, my car has been pretty trouble free (I have much of the service history for the car, and from what I can tell it has only been o2 and maf sensors (2 MAF's...one as a result of my K & N air intake experiment), and a busted coolant tank (very common in Arizona...$200.00 diy). Other stuff is just wear and tear...just replaced the rotors last week...I believe they were original.

I have what looks to be a leak from the coolant tank area. Any suggestions as to the best way to DIY?

I had the same problem with buttons on the radio. the radio was replaced under warranty.

Great, thanks!

I have a 2000 996 with 34K miles that has an occasional leak from what appears to be the reservoir cap. I can see crust around the bottom of the cap and around the screw lip on the reservoir (see photo). The coolant appears to be dripping down the overflow hose and onto the driver's side muffler and onto the ground. I have topped off the reservoir and the temperature gauge reads 180 degrees when warm. Is this common?