When i am at a red light and i push the gas pedal, my tb revs really hard but wont gain speed the way that it should and it is killing my gas mileage and i had a code for the thermostat. i replaced it and now i have a code for po172 system running rich bank 1?
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It could possibly be that there is a wore spot on your throttle position sensor (TPS). It basically is connected to the cable running to the gas pedal and tells the computer how much you're pushing down on the pedal.
If you find that it's bogging down more and more often (like when you need more power climbing hills and never really gets going), it could be that your catalytic converter is clogged, but this will eventually throw some check engine lights.
You may have a oil pressure switch going bad or your idle is too low. The idle should be around 600 RPM. The oil pressure displayed on the instrument panel gauge is not an actual reading, it is made up by the computer. You probably should clean the throttle body as well, make sure to clean both front side and rear side thoroughly. Also disconnect the battery while doing the cleaning. This will allow the computer to reset and relearn.
The P0128 is your thermostat. Your engine isn't getting up to temperature, is probably stuck open.
P1680 has to do with your pedal position sensor. Either way, your PCM either needs to be recalibrated by the dealer OR replaced. This depends on where your VIN # falls on the list of the technical service bulletin that is out there.
Could be many things. I know this is not much of an answer but you need to have scan done to get the "Trouble code" which will most likly give you your answer or at least point you in the right durection. I hope this helped and good luck. Oh and by the way alot of auto parts storres will run the scan for you for free.
Your SUV has an electronic throttle body. Unlike the other type which is driven by cable, this relies on multiple sensors in the gas pedal and multiple sensors in the throttle body. If one or more of the sensors don't agree (i.e: one sensor says you're at 80% it while another says 40% throttle) then it goes in to a default mode or "limp home" mode. It basically makes you take it to be repaired because it is unsafe to be driven.
Replace relay #46 in the fuse box. This is the relay for low beams. Or you could try cleaning the contacts first, which is what I did to fix this problem. I keep a new one in the glove box in case it ever really does go out. Very common problem for our TB's.