Every time I fill up the tank, check engine light with P0125 code

Hey so I own a 2000 4runner and recently, for whatever reason, each time after I refill on gas, the check engine light comes on and whenever I check it it reads error code P0125. However, the error goes away after using up to or less than a quarter of the tank. The coolant isn’t the problem as the level of coolant is fine when the code comes up.



Would anyone happen to have any insight or experience with this kind of problem to know what could be causing it?

 

When you pump gas & it clicks, do you top it off with more gas? Or do you stop pumping?

 

I stop pumping after the the click

 

P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control

Weird. This code points to an engine coolant sensor and not the fuel system.

 

Which is why I’m confused as to what could be causing the problem

 

Did you verify the coolant temperature sensor is good?

 

I know the code is for a coolant temperature sensor, but more than likely it's the front air/fuel sensor(1st o2 sensor closest to engine), had the same code on a older Tacoma years ago and ended up being the A/F sensor

 

It may be happening not because you are fueling, but the amount of time between stopping the engine, fueling and restarting. Your thermostat may not be opening correctly during the restart and you get that code. To test that theory, I'm guessing it takes 5-8 mins to refuel? Take your rig for a drive of maybe 15-20 mins to get proper engine temp, park at home on level ground, shut it down, and wait 8 mins to restart and see if you get it again?

 

From the manual:

P0125 Detecting Condition
After engine is warmed up, heated oxygen sensor (bank1 sensor 1) output does not indicate RICH (< or = 0.45 V)even once when conditions (a), (b), (c) or (d) continue for at least 1.5 mins:
(a) Engine speed: 1,500 rpm or more
(b) Vehicle speed: 25 (c) Throttle valve does not fully closed
(d) 140 sec. or more after starting

Trouble Area
Open or short in heated oxygen sensors (bank1 sensor 1) circuit.
Heated oxygen sensor (bank 1 sensor 1).
Air induction system.
Fuel pressure.
Injector.
Gas leakage on exhaust system.
ECM

If the voltage output of the heated oxyxgen sensor is less than 0.1 V, heated oxygen sensor circuit may be open or short.

Trouble shooting Procedure.
(a)Connect the OBD II scan tool or toyota hand held tester to the DLC3
(b) warm up the engine to normal operating temp
CHECK
Read the voltage output of the heated oxygen sensor when the engine is suddenly raced. (Perform quick racing to 4000 rpm 3 times.
Does heated oxygen sensor output a RICH signal (0.45 V or more) at least once?

 

start checking sensors..

 

are you overfilling your tank ? that can cause your evap system to react