Po171 is lean on bank 1--===causes --MAF/VAF sensors --injectors ---HO2S (heated oxygen sensor)
po300 is random misfires and po301, 2, 3 4 5 6 etc is the cylinder that is misfiring
most likely that the fuel pressure is below the required pressure either from the pump or blocked filter or the tank not venting properly--- (EVAP) problem
check the fuel pressure ( minimum of 45-65psi) --problem pressure regulator , pump or filter
replace the heated oxygen sensor on bank 1 ( in the exhaust manifold before the cat converter) as it reports to the ECM to get the correct air/fuel mix
SOURCE: V6 engine idles rough after restarting, then smooths out
My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.
SOURCE: 1994 Toyota Corolla hard to start when warm
does it have a cold start injector seperate from the other injectors usually on the upper intake somewhere with a fuel line going to it
SOURCE: 12 codes; 90174, p0171, p0175,p0300,p0301, p0302,
90174 (guessing it should be p0174 = system too lean)
92198 (guessing it should be p2198 = Oxygen Sensor Stuck Too Lean / Rich)
p0171, p0175 = system too lean (usually related to MAF Sensor)
p0301= Cylinder 1 Misfire Detected (Coil related most likely)
p0302 = Cylinder 2 Misfire Detected (Coil related most likely)
p0303 = Cylinder 3 Misfire Detected (Coil related most likely)
p0316 = Cylinder Misfire Detected (Coil related most likely)
p0420 = Catalyst System Efficiency Below Threshold
p2195, p2196 = Oxygen Sensor Stuck Too Lean / Rich (most likely the rubber hose from valve cover to throttle body
You may want to have your MAF changed, Coils changed, and your O2 Sensor checked. Also any one of those faults can also trigger another fault. I.E your O2 sensor could be could, but since it's misfiring, it's being triggered because the exhaust gases aren't what it should be. Hope this helps
Testimonial: "Thanks, you was very helpful. Since I got the codes the engine lock up on me. The car light comes on but the car would not start. I had it towed. "
SOURCE: O2 Sensor Problem?
yes an o2 sensor can cause those symptoms so can a minor vacuum leak --bad ignition wire -clogging fuel filter --sticking egr valve etc.
SOURCE: TOYOTA CELICA 2003 CYLINDER 3 MISFIRING IDLE ROUGH
this a tipical simptom of dirty fuel injectors, make a clean on gaae shop
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