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OBD 2 Code P1121

Tiny
JEEPLYFE
  • MEMBER
  • 1998 LAND ROVER RANGE ROVER
  • 4.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
Received the OBD 2 Code P1121 for the vehicle listed above SE Sport Utility 4-door, which is supposedly the accelerator pedal position sensor, yet are not finding the part called "accelerator pedal position sensor".
Thursday, June 30th, 2022 AT 7:48 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

This vehicle doesn't have an APP sensor. The code is related to the throttle position sensor. What is happening as you drive?

See pic below for code info.

Let me know what you are experiencing.

Take care,

Joe

See pic below.
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Thursday, June 30th, 2022 AT 9:06 PM
Tiny
JEEPLYFE
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  • 11 POSTS
This involves a 1998 Range Rover (in basic-Decent condition) that I had barely driven for a while. So, I had replaced some parts and started to drive it just recently and maybe close to a month ago (Maybe in May/June), while I was in some Parking lots it was close to almost being stopped (at low speeds), the engine Shut off, but did crank right back up. The last few times that I drove this SUV, it did not turn off like that, but I did get that P1121 Code from an OBD 2 Scan tool. So, maybe the Throttle Position Sensor is "dirty", or might need replacing? (If I keep getting that P1121 Code and you're saying that the 1998 Range Rover does not have an A.P.P)
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Friday, July 1st, 2022 AT 6:07 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

I dug through a couple of different manuals, and they don't show an APP. The code in the manuals is related to the throttle position sensor/throttle angle sensor.

The TPS should be on the throttle body. Make sure the connection is good and didn't get corroded from sitting. Also, take notice if the throttle body is actuated by a cable.

Let me know

Joe
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Friday, July 1st, 2022 AT 8:55 PM
Tiny
JEEPLYFE
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  • 11 POSTS
So, when you say, "actuated by a cable", I should check if the Throttle Body gets opened up/activated by a cable?

And if a vehicle's ECU (/PCM) repeatedly gives the OBD 2 Code P1610-- Manufacturer Control, does that likely indicate that the particular ECU may be Bad (or NON-programmable)?
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Tuesday, July 5th, 2022 AT 4:01 AM
Tiny
JACOBANDNICKOLAS
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Hi,

Yes, check if it opens. That is what it is telling me in the manual. The throttle angle position sensor may be bad and not the ECU.

Joe
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Tuesday, July 5th, 2022 AT 8:23 PM
Tiny
JEEPLYFE
  • MEMBER
  • 11 POSTS
I'll check for corrosion, etc.
But not necessarily just for this vehicle, but for any vehicle (car, SUV) if the vehicle's ECU (/PCM) repeatedly gives the OBD 2 Code P1610-- Manufacturer Control, does that code likely indicate that the particular ECU may be bad or non-programmable?
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Tuesday, July 5th, 2022 AT 10:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

That code can be caused by an ECM, so yes to that. However, the code, in general, is related to the immobilizer locking the system down due to the non-recognition of the ignition key causing the immobilizer to prevent the vehicle from starting.

In most cases, this can be reprogrammed. However, it differs from manufacturer to manufacturer. This specific code isn't even listed for your vehicle.

Let me know if you have other questions.

Take care,

Joe
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Tuesday, July 5th, 2022 AT 10:26 PM

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