WaldGS430

01 GS430 with 133k. CEL came on and it was and o2 bank 1 sensor 1. Driver side before cat right? Replaced it. Cleared code ran car with no CELs then 30 mins later.

Pop CEL, this time its P0125 (Insufficient Coolant Temperature For Closed Loop Fuel Control). Replaced Thermostat. Checked data with OBD2 scanner and theres no readings to the o2 that i replaced.

Could this be the cause of P0125 being that when the car is at normal operating temp the ecu tells the o2 to check for a reading? if the issue is the o2. Where should i start to get a reading?

Im clueless.. HELP!

WaldGS430

anybody? bump

Och

iTrader: (3)

Sounds like the ECT (engine coolant temp) sensor is malfunctioning. Its around $40 from the dealer.

timber1426

Hey man, hopefully you went with a lexus/toyota o2 sensor. But it sounds like you got a bad sensor. I am a lexus tech and the closed loop will set when the o2 is bad for a long time. Make sure also you didn't stretch any wires. Before getting to far into it. Check the sensor you just put in. good luck man. Email me if you need more help.

WaldGS430

yes i went with a denso o2 sensor. i just replaced it 1000 miles.. cel came on since day one

sam430

iTrader: (10)

Question... is the P0135 the passenger side or driver side? I just replaced the passenger side and still get the p0135 and sometimes p0125. I think the wire must have shorted because the damn plug itself was terrible to work with (short wire, I must've messed it up).

sam430

iTrader: (10)

well, got a chance to look under my car again. P0135 is on the driver side front. I got the chance to stick my hands under there to see what's going on...two wires were sticking out of the plug... I can't see it but I felt it. Now to find out how to repair the wires.

sigh... so damn difficult!