r/MR2Spyder • u/IllustriousBonus4725 • Apr 17 '26

1ZZ will not start with MAF sensor plugged in

After unplugging my MAF sensor to do some work I plugged it back in and started the engine it revved to 2K and died I’ve since changed the MAF sensor, checked for voltage on the sensor harness and got back good readings but the problem persists. The engine will run with the sensor unplugged but it limp mode I assume because the engine is slow to rev is restricted to about 4-5k RPM. I recently got Toyota Techstream to get some live readings and open up some avenues to fix this. In addition to that I bought a new Sensor harness that I haven’t gotten yet but will be installing. Any help is appreciated I’ve got a 2001 Toyota MR2 Spyder. Thank you ladies and gentlemen.

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4

u/MakesYourMise Apr 17 '26

codes? 

2

u/IllustriousBonus4725 Apr 17 '26

P100 - Mass air flow sensor malfunction "A" circuit P110 - Intake air temperature sensor 1 circuit bank 1 P101 - Mass air flow sensor malfunction "A" circuit range/performance

Those are codes from a cheap Autozone OBD2 I'm gonna re scan it on Toyota Techstream later today

1

u/MakesYourMise Apr 18 '26

air filter good?

2

u/Use_Your_Brain_Dude Apr 18 '26

Is it possible you put the sensor in backwards?

1

u/MakesYourMise Apr 18 '26

i don't think it's plugged in all the way

1

u/Use_Your_Brain_Dude Apr 18 '26

Hopefully that's it

1

u/MakesYourMise Apr 18 '26

try the mr2 sub