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MINI MINI Cooper, MINI Cooper S: 2002-2006 P2127 and P2138 Check Engine Light codes


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Last Post: Mar 14, 2016 10:24 AM Last Post By: simsima35
DerekZYX

Posts: 2
Registered: 11/19/15
P2127 and P2138 Check Engine Light codes
Posted: Nov 20, 2015 12:58 PM
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Hello,

I purchased a Mini Cooper "Diagnosis Without Guesswork" manual for my car,
it seems like this manual has all the codes and diagnostic steps EXCEPT for the two I need.

I'm getting the following two codes together, and I'm looking for what to fix:

P2127 - Throttle/Pedal Position Sensor/Switch "E" Circuit Low
P2138 - Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation

When these codes started, the car lost about 80% of it's power in any gear above 1st.

It felt like the car lost about 10% of it's power two months ago (about the time I had transmission work done), but no CEL came on, and I wasn't completely sure.

I see a YouTube video for a Nissan with those same two codes, and it was corrected by cleaning connectors to the throttle position sensor with canned air - I'd try this, but I can't figure out how to get to the Pedal Position Sensor for my Mini - it's the "block" behind the gas pedal, right?

Mini Cooper (non-S) (R50)
2006, hardtop

Any help would be appreciated. This manual is a $100 paperweight (rush shipping).
Dan in WA

Posts: 3
Registered: 06/17/08
Re: P2127 and P2138 Check Engine Light codes
Posted: Dec 19, 2015 5:25 AM   in response to: DerekZYX in response to: DerekZYX
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The name on these codes suggest that the problem could be either at the Pedal Sensor, or the Throttle Position Sensor at the engine.

You say you had some transmission work done? My first guess would be a problem with the sensor on the throttle shaft - that one is more likely to be disturbed during a transmission job than the one at the gas pedal, I think. Check for the harness plug to not be fully engaged, or I've seen the pins in the connector get pushed back, and lose contact that way.

Did you have the transmission serviced, then noticed the 10% suspected power loss? Or did the power loss come first?

How much later did the codes show up?

Lastly, the Pedal Position Sensor will have a wiring harness attached to it, that should help identify it.
simsima35

Posts: 1
Registered: 03/14/16
Re: P2127 and P2138 Check Engine Light codes
Posted: Mar 14, 2016 10:24 AM   in response to: DerekZYX in response to: DerekZYX
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Hi, i have a mini cooper s 2004. I have come up with the same codes and the same problem car goes in to limp mode. I have replaced the throttle body also the pedal (both second hand parts came from a working one) but the problem is still there. Any suggestions please.

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