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I was driving back to my office from a meeting and the CEL came on (first time in 4 - 1/2 years of ownership).

The car was driving OK so I drove it home and hooked up the code reader.

It showed only one code - P1140.

I've searched and come up blank as to what this means. Any info would be appreciated.

Car is a 99 Carrera Cab with Tiptronic.

Thanks in advance for any assistance.


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P1140 Load Sensing - Signal Implausible

Possible cause:

- Improper adjustment of operating cable for cruise control.

- Throttle position sensor.

- False air.

Loren, thanks for your prompt response. Any possibility this fault could be caused by the idle air control valve?

I've been having an intermittent issue with the idle hunting around. I've cleaned the valve but the issue persists - not all the time.

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  • Admin

Well, the idle air valve can stick or get weak and not open all the way. But usually you would also get an idle valve error (P0506 or P0507).

A worn or sticky throttle position sensor can cause this fault. Have you cleaned the throttle body and butterfly well?

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