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After replacing the oil filler tube wtih out removing the intake manifold, which was BTW very difficult with adult hands, I started getting the P1124 & P1126 codes. After deleting the codes several times, it came on a few times after this. Last time I went to the car for a quick warm up after sitting for several weeks, the code just disappeared. Last week after a 150 miles run as I was parking the car the CEL light came on. Once I got home I scanned it and both the P1124 and P1126 were on as well as a new code P0150. I got a respectable 28MPG at highways speeds and some city driving during the trip. No missing, or performance issues. I will check all the items I have read about to make sure there is no vacuum leaks. I already triple checked the oil filler tube and there was no leakage or issues there.  If there are any other things I should check out, Let me know. 


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  • 1 month later...

Replacing the oil filler tube in tight quarters is tough.  I would start with chasing every vacuum hose to see if one came loose!  Also, when I swapped out an oil filler tube once the dipstick tube also needed replacement.  You can cut out a section and slice in surgical tubing in it's place.  

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Also, the black plastic vacuum tubing used in the secondary air system gets very brittle over time and it does not take much to crack one.  I second kbrandsma's comment about looking for a loose vacuum hose but also look very carefully for a damaged/broken tube.  It would be very easy to do while changing an oil filler tube without realizing that you did.

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