P1121 Code

Tiny
RUSH1COUGAR
  • MEMBER
  • 2002 FORD RANGER
  • 6 CYL
  • 2WD
  • 112,000 MILES
2002 ford ranger pick up throwing obc code P1121 - check engine light is on - need to have smogged this month; what do I need to replace/check?
Friday, March 11th, 2011 AT 4:08 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Fault is with the Throttle Position Sensor. Testing have to be done before replacing component.
KOER & Continuous Memory DTC P1121: Check Rationality Operation Between TP & MAF Sensors
This DTC is set when the comparison between TP and MAF sensor readings are not consistent with calibrated load values during KOER self-test. Possible causes for this fault are:

†Air Leak Between MAF Sensor & Throttle Body
†TP Sensor Not Seated Fully
†Faulty TP Sensor
†Faulty MAF Sensor
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Friday, March 11th, 2011 AT 12:55 PM

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