rough idle with p1124 and p1126 CEL faults

[karpo1]

I have a 1999 boxster 2.5 with 98000 miles. I recently have been getting p1124 and p1126 after reset usually takes awhile before it comes back. Also have rough idle. I cleaned the MAF sensor and checked for any air intake leaks. Any suggestions on a fix or toubleshooting the MAF and O2 sensors. The sensors are pricey and would like to confirm the bad part before purchase and installation.

Edited February 14, 2008 by karpo1

[Loren]

:welcome:

Please do a search here as this topic has been covered many times.

[D_Man]

Dude,

My car was throwing those codes for months, I tried everything: Clean the MAF, replace the MAF, tighten up air cleaner all the logical things.

The problem 9 time out of 10 is a major air leak to the crankcase somewhere. I fixed mine by taking it to the dealer and the source was torn bellows hose to the oil separator. There are several of these on the H20 996's and Box'trs. I would start by inspecting yours.

Parktown in St Louis

Rubber bellows tube.

996 107 237 52 Bellows tube

$419.59 replaced at dealer.

You might be able to do it your self provided thats the cause, these are very hard to access with out a lift because of the wierd angles.

Here are some links to get you going....

http://www.renntech.org/forums/index.php?s...&hl=bellows

http://www.renntech.org/forums/index.php?s...83&hl=p1126

D_Man

oo

[markdav]

+1 for Oil sep/bellows. Changed mine a year ago and everything cleared. You need a good pair of angled nose hose clamp pliers and quite a bit of patience. There are some good posts in this forum for the procedure.