2005 Prius 240k miles Recent work: new MAF *, new plugs, new coils, pour-in injector cleaner. Oil change, new tires, new windshield. Just finished a 2700 mile jaunt with no problems. *The new MAF failed (gee, thanks AutoZone) so we reinstalled the old one and cleaned it with MAF spray cleaner. During small-city traffic at 30mph, 80 degrees moderately high humidity, CEL came on. No symptoms were observed; no loss of power, jerking, noises, nothing. Techstream gave me three codes, all current and historical. P0102, P0113, and P0456, which is also pending. Since two codes point to the MAF, I'm planning to replace that. It is a cheap enough part to make throwing a bit of money at the problem relatively unpainful. Has anyone seen this trio before and found a fix? Thank you.
Maybe these pages will help you figure it out. That last one seems unrelated. I think I'd start by making sure I had all the intake air hose clamps snugged down properly and that there aren't any other intake leaks. I seem to remember getting at least one of those the time I forgot to reconnect the MAF plug after cleaning my throttle body. But it was immediate. Might have come unfastened or broke a wire? P0102 2004 TOYOTA PRIUS Mass or Volume Air Flow Circuit Low Input P0113 TOYOTA Intake Air Temperature Circuit High Input P0456 2008 TOYOTA PRIUS EVAP Control System Leak Detected Very Small Leak
As the temp sensor and the MAF are in the same unit, it might pay to check the plug and wiring first, before concluding the sensors are at fault.
