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1999 Lexus ES 300 Engine light

Tiny
STOPPER713
  • MEMBER
  • 1999 LEXUS ES 300
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 87,000 MILES
My 1999 Lexus ES300 has the Engine light on with the following codes 1. P0125 &. P1133, The car runs fine except it will shut off at Idle. I have replaced the O2 sensor, sensor 1 bank 1, to no avail. Went to a mechanic who told me that it's the idle motor and for $800 he will fix it. I checked all the vacuum lines and they seem OK. I have rigged the trottle so that the car will idle. Please advise.

Thanks.
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Saturday, January 31st, 2009 AT 5:22 PM

1 Reply

Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
Before you shell out the money, the idle air control is not your problem. (Even if it were, it only took 1.1 hour and $230 part to fix. I could not justify the $800 invoice). Anyway, you have two problems.

1. P0125 Insufficient Coolant Temperature For Closed Loop Fuel Control. Check your coolant level. Make sure that it is full. Then, check your engine coolant temp sensor. If you see the wiring bad, repair. If not, you may need to replace the sensor.

2. P1133 Air/Fuel Sensor Circuit Response Malfunction (Bank 1) You have a problem with the ECM ground to the O2 sensor Bank 1 Sensor 1. The sensor is not your problem, rather the wiring (usually ground, which connects to the ECM) is bad.
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Wednesday, February 4th, 2009 AT 2:18 AM

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