Check engine fault code

2003 3.4 Double Cab. Check engine light is on. No others. Popped into Advanced Auto Parts store, reader came up with "open in stop light switch circuit". All lights work fine. I have done no changes or mods on truck. Ran reader 3 times, once after disconnecting and reconnecting battery. Code is on as soon as key is turn on. Ideas? Thanks.

 

What is the actual code number?

 

Check "stop" fuse 1st, then Check Ig1 fuse

 

May be e brake
https://www.tacomaworld.com/threads/brake-dash-light-came-on-code-c1249.310996/

 

I searched but didnt find this thread. Same code as I came up with, C1249. I haven't touched ebrake in weeks since last at the boat ramp. I'll check brake in the morn. Thanks.

 

The brake light switch has 4 wires that go to it and 2 circuits. I believe on is for the computer.

 

Diag. info attached

 

Remember a code is the complete circuit for what ever switch sensor etc.

So the complete circuit needs to be checked along with the ECM

 

The first thing you should do is this:
Check voltage at the "STP" wire at the ABS module with the key on and someone stepping on the brake.

I saw this problem a lot while working at Lexus. The brake switch is probably bad.

 

Update. Went to my buddy's repair shop. He used his "pro" reader. It called out front o2 sensor. R&r'd sensor with new. All works fine, no check engine light.

 

What was the code number you were getting to start with?

 

Code reader at Advanced Auto Parts read c1249. Reader at my buddy's shop said fwd o2 sensor.