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Guys my MY 97 boxster was i thought fault free after replacing all of my o2 sensors with new (Bosch) ones, replaced the MAF just starting driving it again and again I get the CEL ... any idea's?

codes p0140, p1125, p1123 and p1117 ..its driving me crazy!! Also i just opende up my engine compartment and i saw oil ON TOP of the engine, how is this possible? I know the dealer replaced my oil return hose but is this broken again or is this to less info to diagnose this? I know i have to replace my IMS or RMS already...nightmare!

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Edited by sliderr
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Oil on top of the engine is a symptom of bad oil fill tubes. Easy to check. How is your AOS. A faulty one can raise havoc on your fill tubes.

It sounds like the expensive parts have been replaced. I would replace your gas cap if original and check for vacuum tube leaks and leaks in air supply or arounf airbox. Do one thing at a time. Reset your codes and dive through several drive cycles to determine what is going on.

Fault Code P1602 usually is a recent disconnected battery. It should go away after clearing.

Good luck!

Edited by kbrandsma
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  • 2 weeks later...

Hi guys, i tried what you advised, with a warm running engine i removed the oil cap, when i removed it (easy) i heard a lot of sissing from sucking air into the engine (i guess), is this normal, also it resulted some smoke coming out of the oilcap gap? is my AOS bad??

Normally, a bad AOS will have an unusually high vacuum in the sump. Try removing your oil filler cap with the engine running, it it is difficult to get off, you have a bad AOS.

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  • 4 months later...

I had oil on the top of my engine too. Wasn't sure where it was coming from, as I apparently also have a vacuum leak I'm troubleshooting. Thought maybe it could be from that.

I bought both sections of the oil filler tube that's in the engine bay. After pulling most everything off the top of my engine, found the bolt under the alternator which holds the oil filler tube to the engine, was loose. Took several turns to tighten it. Also, the other end which connects to the rear firewall, had a piece of the pipe "tucked" in as it was fitted to the tube on the firewall, also creating a leak. Replaced both sections of my oil filler tube. Hope it solves my oil leak problem.

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