P0120 and P0133

[ServiceRunner]

Good afternoon.

I have a 1997 Limited 4Runner with 160K miles. I have owned it for about 2 weeks and the engine light just came on. I had them check the codes at the parts store, and P0120 and P0133 came up. I was hoping that someone else had already been through this and would be able to share their resolution. The only symptom I have is that the idle will vary up and down on a cold start. It seems fine after that.

 

[ServiceRunner]

Update to CEL

UPDATE

Based on the codes, I replaced the Throttle Position Sensor. So far the CEL is off and the motor is running okay.

 

[ironhippy]

I had the same idle problem on cold starts, but a different code (p0172). replace the TPS and everything has been fine since. MPGs went up too.