Code 1125

OMAEL

MEMBER
2003 ISUZU ASCENDER
5.3L
V8
4WD
AUTOMATIC
198,230 MILES

My car is Isuzu Ascender 2003 Limited Version.
It's missing fire, can't move. After do the scanning I received this code P1125 (talking about Throttle Position Sensor) and another code P0420 (oxygen sensor 01).
Please help me to solve those problems. Thanks.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,536 POSTS

Hello,

P1125 - The Power-train Control Module (PCM) detects that the difference between Accelerator Pedal Position (APP) sensor 1 and APP sensor 2 is more than the predicted value. This code can appear from one of two reasons first is the throttle bore is dirty and needs to be cleaned. The second is the throttle pedal sensor when bad lets try the cheaper of the two fist here is a guide to help you fix the issue. (I hope)

https://www.2carpros.com/articles/throttle-actuator-service

if this doesn't work here is how to change out the throttle pedal position sensor. Check out the diagrams (below). Please let us know what happens.

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