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Engine Codes

MJ'sTacoma

MJ'sTacoma

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2018 Toyota Tacoma 3.5L
I recently had my check engine light on, The truck was giving the following codes:
P0598 - Thermostat Heater Control Circuit Low
P0037 - O2 Sensor
P0057 - O2 Sensor
P0441 - EVAP System

I spent about two hours on google and found no info about these codes happening on other tacomas.
I replaced both O2 Sensors and the thermostat, reset the codes and nothing happened, Still had a check engine light.

Turns out it was an add-a-fuse I had in the main fuse box that was causing the ECM to have some sort of glitch.

I wanted to post this so anyone looking for those specific codes can check the fuse box before having to unnecessarily replace parts.
 
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MJ'sTacoma said:
2018 Toyota Tacoma 3.5L
I recently had my check engine light on, The truck was giving the following codes:
P0598 - Thermostat Heater Control Circuit Low
P0037 - O2 Sensor
P0057 - O2 Sensor
P0441 - EVAP System

I spent about two hours on google and found no info about these codes happening on other tacomas.
I replaced both O2 Sensors and the thermostat, reset the codes and nothing happened, Still had a check engine light.

Turns out it was an add-a-fuse I had in the main fuse box that was causing the ECM to have some sort of glitch.

I wanted to post this so anyone looking for those specific codes can check the fuse box before having to unnecessarily replace parts.
Click to expand...
Was it Raptor Lights? 😁
Shot you a message about the O2 sensors if you got stuck with them.
 
Upvote 0
MJ'sTacoma said:
2018 Toyota Tacoma 3.5L
I recently had my check engine light on, The truck was giving the following codes:
P0598 - Thermostat Heater Control Circuit Low
P0037 - O2 Sensor
P0057 - O2 Sensor
P0441 - EVAP System

I spent about two hours on google and found no info about these codes happening on other tacomas.
I replaced both O2 Sensors and the thermostat, reset the codes and nothing happened, Still had a check engine light.

Turns out it was an add-a-fuse I had in the main fuse box that was causing the ECM to have some sort of glitch.

I wanted to post this so anyone looking for those specific codes can check the fuse box before having to unnecessarily replace parts.
Click to expand...
 
Upvote 0
MJ'sTacoma said:
2018 Toyota Tacoma 3.5L
I recently had my check engine light on, The truck was giving the following codes:
P0598 - Thermostat Heater Control Circuit Low
P0037 - O2 Sensor
P0057 - O2 Sensor
P0441 - EVAP System

I spent about two hours on google and found no info about these codes happening on other tacomas.
I replaced both O2 Sensors and the thermostat, reset the codes and nothing happened, Still had a check engine light.

Turns out it was an add-a-fuse I had in the main fuse box that was causing the ECM to have some sort of glitch.

I wanted to post this so anyone looking for those specific codes can check the fuse box before having to unnecessarily replace parts.
Click to expand...
I have the same exact issue with the add-a-fuse for grill lights. Took the add-a-fuse out, but check engine light has persisted for about 30 miles of driving. How quickly did your engine light go off after you removed the add-a-fuse?
 
Upvote 0
I had to reset the code for it to go away, I have an aftermarket head unit that allows me to see codes and reset them.
With any scanner you should be able to reset them.
 
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