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rough idle with p1124 and p1126 CEL faults

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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 by karpo1
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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....





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