Codes p0125 and p1135

2000 TOYOTA CAMRY

127,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC

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I've encountered p0125 lots, typical thermostat code.

Installed new, code returned, always with p1135 (bank 1 sensor 1)

Installed new engine coolant temperature sensor, reads proper now. Bled coolant

Same codes. :(

Fans were not kicking on, fan sensor faulty (related? I don't know)

Read the TSB about the A/F heater circuit loose connections. Open both the little fuse box and the long one on the driver's inner fender. Fuse and pins missing on both! No relay, no fuse, no connections.

I have a b1s1 coming, but this is very weird.

Every video and tech tip i have read ends at the things i have done and ends at the heater circuit.

Anyone?

Oct 21, 2021 at 12:15 PM

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SQM

AUTOMOTIVE REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

There are few different reasons why you could get the P0125. EGR issue, fuel injector issue, gas leak on exhaust, ECM etc.

I have attached a step by step troubleshooting guide for the P0125 below.
See if that helps you find the issue.
Thank you.

https://www.2carpros.com/trouble_codes/obd2

Images (Click to enlarge)

Oct 21, 2021 at 1:13 PM