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Originally Posted by 2000SoCalBoxsterS
I have a code reader and a list of the definitions for these codes from three different sources. Typically I've seen advice that these CEL codes are probably a bad or dirty MAF. But my question is, why does the actual code definition say it involves my O2 sensors? Should I replace all four of my O2 sensors? I hear they are about $130 a piece.
I cleaned my MAF today what are the chances that will take care of my CEL problem?
The MAF. This thing cost $250 online $400+ from the dealer! I sprayed electronic parts cleaner on the contact points. The paper clip looking thing.
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The codes 1128 & 1130 are for each individual bank running lean, or that the ECU cannot control the mixture properly, (1128 is for 1-3.., 1130 is for 4-6.. or something like that..).
The fact that the code descriptions say "O2 sensors.." is not representative of the total number of conditions that need to be met to set the codes. The codes are an indicator of the affected system, not for an individual component. It is still up to the technician to properly diagnose the problem, and repair...
I had the same codes poping up on my 2000 boxster for about 8 months.. I used to be a mechanic for Porsche untill 2000 when I got my degree in electrical engineering, so now that I sit on my arse & play with electronics all day, I really didn't want to tinker with the car. So, out of lazy-ness, I tried the first thing that seemed to make sense, clean the MAF & drive it around fer a week or two.. that fixed my problem... its been a year and no CEL...
So, from my expierience, clean the MAF.. & drive...
if the code resets, well then you gotta start testing the system...
Start with the obvious first, vacuum leaks. check the plastic plenum real good, I have seen a few split or crack & cause a temperature sensitive leak..
since both codes set, what ever it is, it is common to both banks.. (on this alone you can rule out the O2 sensors..)