P0125 and P1135 OBD Codes on 2000 4 Runner

I took my 2000 Toyota 4 Runner 4WD automatic (V6 engine) to get the check engine light checked out. The dealer said the diagnostic came back with codes P0125 and P1135. I was told that the P1135 meant I needed a new A/F Sensor (Bank 1 Sensor 1). Can anyone tell me where this sensor is located? I was thinking of changing it myself. As far as the P0125 goes, I was told that a coolant flush would resolve this? Any help would be appreciated. The dealer wants @ $650!!!

Thanks

I doubt a coolant flush will resolve any dtc! As For a Fuel Air sensor it's similair to an 02 sensor mountted in the same place, buy the sensor from the dealer as in some years they aren't the same and if you put the wrong one in it won't repair it! Other Toyota's posts recently will confirm this!

a p0125 is an indication that your coolant engine isn't reaching operating temperature, usually a thermostat change will whip it into shape, if your coolant has never been changed, it's probably a good idea to throw some new coolant at it since you have to drain it to change the stat anyways, don't forget to mix it 50/50 or so.

Sorry to hear about the problem have you found out any more info on how to fix. just found out today that i have same with a code p1155 sensor heater circuit bank1 sensor2 besides the other two. so i know exactly how you feel. i love my toyota camry. first car in many years that i can honestly say that about.

i have same problem with my used toyota 4runner parts.. they giving error code of p0113.. i just thinking for buying a new oxygen sensor.. but how do i know which one to get?

See your local toyota dealer they'll get you the correct one