Engine Codes

[MJ'sTacoma]

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.

 

[bonifacio]

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.

Was it Raptor Lights?
Shot you a message about the O2 sensors if you got stuck with them.

 

[MJ'sTacoma]

It was the alpha rex headlights!

 

[bonifacio]

Did you check all the wiring? Figure out what exactly caused it?

 

[MJ'sTacoma]

Did you check all the wiring? Figure out what exactly caused it?

Removed the add a fuse, it was like magic, the wire seemed to be ok, no tears or chafing

 

[bonifacio]

Which slot and what size fuses?

 

[MJ'sTacoma]

Efi no.4
It had a 5amp add a fuse

 

[Steve Skinner]

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.

 

[Steve Skinner]

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.

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?

 

[MJ'sTacoma]

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.

 

[Steve Skinner]

Thanks! Codes went away after about 3 drive cycles and 40 miles or so.

 

[MJ'sTacoma]

Awesome, glad this could help!

 

[hapan]

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.

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

Sometimes these codes aren’t caused by failing parts but by something simple like an add-a-fuse in the main fuse box causing the ECM to glitch. Checking the fuse box and any aftermarket electrical mods first can save a lot of time and money before replacing sensors or the thermostat.