How many times can you get the same CEL?

[babur]

Darn! CEL came back on! What a suprise! But this time, I can feel the loss of power and a little rough idle!
The mechanic who changed the AOS said that he cleaned the MAF and throttle body. But again, the car was burning so much oil that I am wondering if it messed up the MAF and/or spark plugs. Is it possible? Just to put in perspective, before the car stalled on the highway, my oil gauge showed full and "below min" and blinking after it stalled!
Thanks
Bob

[Topless]

If your CEL error codes are still P1128 & P1130 your car is still running lean. This means a failed MAF or intake air leak. A hissing sound points to an intake air leak as the most likely cause for your problem. If your mechanic does not recognize this or believes that changing spark plugs will somehow resolve a lean mixture condition... get a new Porsche mechanic.

Troubleshooting and diagnosis requires the simple process of elimination. List all the possible causes, one by one eliminate each starting with the most likely cause. This works every time.
1. Bad MAF- unplug your MAF and drive the car. If it runs much better, replace the MAF.
2. Torn intake hoses- inspect one by one and replace as needed.
3. Loose hose clamps- inspect and tighten.
4. Torn AOS Bellows- replace
5. Cracked oil fill tube- replace
6. Bad gas cap- replace

And so on and so on.

If it were my car I would begin by opening up the engine cover, start the car and just listen/poke around for the hissing sound. Some will use propane to identify an intake air leak but I totally singed my eyebrows once with a propane flash fire so I am not a big fan of this method. Maybe just a loose hose clamp. No reason to get hosed with unnecessary repair charges.

Get your error codes first to confirm the problem and then proceed. Good luck!

[mptoledo]

I noticed that I get an o2 code when I use the fuel additive. I think its the chevron techron. I usually just disconnect the battery and don't see it for 3 months when I do it again. It usually happens when the engine is hot after driving for a few hours and the tank is close to 1/4. I had the codes checked twice but noticed that it happened after I filled up and added the techron.