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Like it says in the title, throwing a few codes on an ’05 Tacoma 2.7.
P0300- Random miss
P0171- System Too Lean (Bank 1)
P0172- System Too Rich (Bank 1)
P0125- Insufficient Coolant Temp. for closed loop fuel controlThe only driveability problem I’ve felt is the misfire. I am also assuming that my P0125 is causing everything else. If the ECU doesn’t see the temp it needs to, it will cut/add fuel, thus causing the three other codes. I have access to a scantool and the truck runs at 176 degrees, which ALLDATA considers to be normal, although it is at the lower range of normal. I’m also part of a tacoma forum and one of the peeps gave me this bit of info:
“Interesting thing! I just went into Mitchell1 service information and actually looked up the Toyota diagnostics for what the failure conditions are, and what can cause this code to set. According to Toyota, the P0125:
‘DTC is set when sensor (Oxygen sensor) does not output a rich condition once engine is at normal operating temperature, engine speed of 1500 RPM or more, and vehicle speed is 25-62 MPH for at least 2 minutes.’
According to Toyota, the most probably cause for this code is a faulty oxygen sensor (the one in the front of the cat)
I admit this is very different from the diagnostics of other manufacturers, but this is direct from Toyota.”I will check my fuel trims and post them up in a little bit.
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