Recurring ODB II codes

[toddwess]

Okay, I get a CEL light and the codes are P1126 and P1133.

I remove the MAF give it a good cleaning and replace it. Tighten all air intake hoses and reset the CEL.

About 300 miles later, I get the CEL again. This time, only P1126.

Clear the CEL light.

About 400 miles later, I get the CEL again. Again, the P1126.

I leave it alone (I don't clear the CEL) and wait about another 100 miles and check again, and now I have the P1126 and P1133 codes.

Clear the CEL Light.

300 miles later, CEL again.

This makes no sense. If the MAF is bad, the CEL should come RIGHT BACK ON, right?

Thoughts and input are quite welcome.

Todd

[nick49]

Replace the MAF, it takes so many drive or start cycles with a bad MAF to have the CEL on again.

[akpud]

Replace the MAF, it takes so many drive or start cycles with a bad MAF to have the CEL on again.

Just a heads up - I've replaced the MAF and the O2 sensors twice, cleared the CEL and it always comes back on within a day or so. I've given up at this point........................

akpud

[Rolando]

A bad MAF would also give you P1124 along with the P1126; same thing with an air leak. The oxygen sensor before cat on cylinders 4-6 side may be bad. I doubt all injectors on one side are acting up.

[toddwess]

A bad MAF would also give you P1124 along with the P1126; same thing with an air leak. The oxygen sensor before cat on cylinders 4-6 side may be bad. I doubt all injectors on one side are acting up.

Thanks for the feedback. That makes sense.

Porsche dealer said the MAF needed to be replaced due to the voltage readings were at their minimum and not moving, but did not show me the codes on his screen.

That was about a week ago, and I ordered a MAF from Pelican Parts.

It arrived today, and I put it in then started the engine.

No change what-so-ever. I heard others saying that their RPM's fluctuated wildly for about a minute or two. Mine was running exactly the same.

Also, the CEL did not go off.

I guess, I'll replace the O2 sensors next . . . by the way, where are they? Is there a DIY for O2 replacement?

Thanks,

Todd

[z281974]

The CEL will not necessarily go off by itself immediately after a repair. I assume you didn't reset it? You must reset the CEL and give it some time. The two codes codes you mentioned indicate faults in both engine banks. While two oxygen sensors could have failed simultaneously, its not that likely. Good luck.

Tom

[toddwess]

The CEL will not necessarily go off by itself immediately after a repair. I assume you didn't reset it? You must reset the CEL and give it some time. The two codes codes you mentioned indicate faults in both engine banks. While two oxygen sensors could have failed simultaneously, its not that likely. Good luck.

Tom

Thanks so much for this. I agree, it really seems odd that both sides would loose control at the same time.

I hope the MAF doesn't come back on. We'll see.

Todd