Problem update: Now CEL illuminated

For the last couple of weeks my PSM and ABS warning lights illuminates when I start the car and puts in a gear, forward or reverse. This evening the CEL came on while driving my car. I therefore took my OBDII reader and checked if there was any store trouble codes and the reading showed: �P2096 Control unit 11 Status confirmed OBDII: Post catalytic converter fuel trim (FT), bank 1- too lean� Any thoughts about this? It can�t hardly be a coincidence that all these three lights illuminates in a short period of time. Can a faulty oxygen sensor trigger the cars PSM and ABS-system or is it something wrong with the DME? Thankful for advise, input and help

Hmmm...here is what I would do: clear the code, disconnect the battery to clear the DME/ECU, go for a drive and see if it throws another code. Could be the MAF sensor or one of the O2 sensors, post cat on Bank 1.

P2096 is a fault code or the O2 Sensor, though it is interesting that you are getting PSM/ABS lights and not a CEL for that code. The reason why people are telling you to check the MAF is because for whatever reason, on the 996, the MAF sending faulty data will trigger the PSM/ABS lights and not a CEL. I do not believe this is true for the O2 sensor, but I am not an expert, I am saying this because in every other instance I find for your code it is accompanied by a CEL. I had found a thread on Renntech where the problem ended up being shot catalytic converters... Not trying to send you down a rabbit hole, but I feel like at this point just throwing O2 sensors at the car is throwing parts at it before we know the solution for sure.

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Thanks for the input. The CEL did came up today and I find it strange that all these three warning lights come up in such a short time in between?

I'm sorry @Bengan035 , I am finishing up a busy week and my reading comprehension obviously took a steep dive. Your thread title literally says your CEL is illuminated. *facepalm* I'd definitely be looking at those O2 sensors in this case. The MAF might be affected by this as well and is throwing up the PSM/ABS light but it sounds like you definitely have a faulty O2 sensor. There are many guides online how to replace this yourself. It shouldn't be above your pay grade, though, those O2 sensors can be in there pretty sung and you may need to hit them with some heat and bolt-breaking fluid.

Uhg, u dont have to throw parts at it. U can graph the o2 sensors with a $20 obd2 bluetooth plug in to see if they r working. I think some of the logic is backward here. Its more likely that the maf is failing by the random lights illuminating and causing the dme to not properly adjust the fuel curves. If faulty maf data is causing a bad mix then it will trip the o2 code.

As De Jeeper says, first things first. P2096 is the O2 sensor. DBJoe996 is right about reset of DME to test system again. Two different O2 sensor parameters to check: resistance and voltage. See if the post cat sensor is working. If you get a resistance of, say, 64 Ohms and doesn�t fluctuate, it�s dead. Compare before and after cat readings with the other bank and same side bank. If the suspect sensor is bad, the voltage will not follow the pre cat sensor sine wave path�flat line (0) instead. So you probably need to replace the black wired sensor with gray connector. The upstream or pre-cat sensor wire is blue. The MAF really doesn�t do much at low rpm. That OBD II fuel trim code is not one I�m familiar with, but probably is generic for �the post cat sensor isn�t working so the DME thinks it�s running lean on one bank.� The ABS samples rpm and throttle position to send proper signals to PSM. O2 sensors and emissions-related CEL's

Why didn't you update your original thread https://rennlist.com/forums/996-foru...#post18364675? Could an admin please merge? Makes it easier to see what has been mentioned as next steps in troubleshooting. You don't seem to respond to those suggestions and what result those yielded either which I find strange. Almost as if you like posting about it more than getting rid of it. Of course it's harder work than posting on here but jeez man, put some effort in and get your hands dirty.. For instamce did you unplug und plug back in the MAF connector in the meantime? Especially since your getting a CEL (the already not properly seated plug is (after further driving) only making contact intermittently and finally throws a CEL ). I repeat what I wrote earlier: wheel speed sensors have the highest chance of being the cause for PSM and ABS light, the CEL is unrelated. Please give us who post suggestions of next trouble shooting steps the satisfaction of hearing whether we were right (or not) by following up with the result you got by executing said step(s).

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^^^ right, I agree..the feedback on steps/tests/checks/ are critical... Sounds like two separate problems...an ABS problem and an 02 Sensor problem.. You can likely find and fix the 02 Sensor problem with a Generci OBDII scanner.. but the ABS is a separate system with its own control module and set of codes that needs a more sophisticated scanner/tester to get the codes and actual values...