Codes Popping for MAF (P0102), Both O2 Sensors (P0135 & 0141), and Evap System (0443)
Chance they failed separately, or could this be a systemic issue?
Iíve had this CEL on for a while now, and bought a simple OBD scanner a while back to try to figure it out. Saw that the codes commonly popping were emissions-related, and decided it wasnít worth the hassle since performance wasnít really affected. I would scan the codes and clear them every now and then and keep tabs on what they were, but never really needed to do something until transferring it to a state that does emissions testing.
First time I had it tested (using a self-service kiosk, the only way Iíve done it), I had recently cleared the codes, so the only one that popped was P0102 (MAF). I replaced the sensor, then had to get it retested. Since I didnít bother to clear anything beforehand, the 4 codes Iíve seen most recently popped, even the one for the sensor I had just replaced.
So what are the odds that all of these systems have failed and need replacing? Because of how long Iíve let this CEL linger, Iím not entirely sure in what order and in what spacing they each might have failed, so itís not clear if there was an order of operations, or if they all failed close enough together to be considered practically simultaneous, or suspiciously like a system issue that is affecting multiple things (or at least, causing multiple codes to pop). But since I replaced the MAF and that code is still popping, weeks later, could it be a dreaded wiring issue? Iíll give them a good look over to check for visible damage, but when it comes to car electrical systems, the extent of my knowledge is how to jump a battery and properly install a powered audio system.
I would love to just replace the evap thingy (for lack of a better term) and the O2 sensors and be done with it, but if there are some wires and connections I should test first so I donít waste time and money, Iím for it. I have a digital mulitimeter, and actually just replaced the batteries not too long ago I believe.
This is an í05 base model, with one of those k&n washable oiled air filters and a flowmaster muffler (all modification by previous owner, my stepbrother).