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Message: <blockquote data-quote="Tonimus" data-source="post: 24413" data-attributes="member: 12914">Sorta related; bought my '06. Ran great, put 200 miles on it, no problem. Get a CEL around town for MAF sensor function. Hose out the sensor with MAF cleaner, clear the light, no more issues for another 200 miles. Going camping and halfway up the rim, I get a CEL. Too rich bank 1 and 2. Long term fuel trims are -18% and -19.5%. Short term are fine, so it's not CRAZY rich.Lots of thinking about it. Went to a wrecker, got a Denso MAF, cleaned it and installed it. Threw a 20oz can of SeaFoam injector cleaner in half a tank. Ran that tank almost dry. Filled it back up. 25 miles into the new tank, light goes out. Long term trims are now -4% and -4.5%. $20 for junkyard MAF, $17 for a big can of SeaFoam.As far as the heater performance code, I suspect the computer is looking at ambient air temp when factoring how long the O2 sensor should take to heat up. Probably a lookup table for that. It's entirely possible it's marginal and takes several cycles to detect. You could also disable that DTC pretty easily for around the same price as two new sensors, then you have the bonus of an extra tool.</blockquote>