ES300 MODEL 2001 I HAVE ISSUE WITH THIS CODE P0125

Asked by Jul 30, 2017 at 01:31 AM about the 2001 Lexus ES 300

Question type: Maintenance & Repair

(Insufficient coolant temperature for closed loop fuel control) WHATS THE EXACT PROBLEM?  
I HAVE SMOKE IN EXHAUST,
THE THIRD GEAR DOESNT CHANGE,
THE RACE MEATER IS UP,
ALLITTLE SHACK.

3 Answers

60

Check the vehicle history report for free with the VIN using www.lemonchecks.com

1 people found this helpful.
4,610

I had this on a 97 Avalon and I chased a few parts until I found an issue with B1S1 wiring harness from a shop that had done some work on the rear valve cover gasket. They pulled in the wiring and internally broke a wire. It was not visible.

Best Answer Mark helpful
135

For less than $20 you can change the heat control sensor. It's located next to the temp gauge sensor. It's on the passenger side of the engine. I had to unplug one of the sensor's to figure out which one controls the "Gauge" inside on the dash. Then change the other one. The sensor tells the computer what temp the engine is running at, and your 3rd gear issue should go away. DIY type of job. Install with plumber's tape, to insure it will not leak.

1 people found this helpful.

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