P0121 – Throttle Position Sensor 1 Performance 99 Jeep Wrangler - Jeep Wrangler Forum
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Old 11-11-2011, 08:04 PM   #1
Join Date: Nov 2011
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P0121 – Throttle Position Sensor 1 Performance 99 Jeep Wrangler

Hey Anyone who can help,
Had check engine come on while driving on highway, shortly afterward felt a lurch while climbing hill in 5th gear. Event has been associated with an odd smell. Got the diagnostic code
P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem. I own a 99 Jeep Wrangler Sport, 4.0 L manual. Thanks for any info.

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Old 11-18-2011, 03:21 PM   #2
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First make sure there is a good connection at the throttle position sensor (no mud/dirt/water). Clean the connection and plug the sensor back in. If it continues it is most likely the sensor itself that needs replaced. They aren't very expensive. Maybe 30 bucks or so. Very easy to change yourself.

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Old 11-18-2011, 03:49 PM   #3
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I got mine at autozone for like under $10.00 bucks
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Old 11-20-2011, 02:42 PM   #4
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Thanks for ideas, will give them a try.
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Old 11-20-2011, 04:00 PM   #5

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i had the same code. cleaned it which helped for a week then it did it some more. new one fixed the problem.
2003 Rubicon, 4.0L, 5SPD, Custom 4.75" lift, 33" MT Baja Claws
1999 SE, 2.5L, 5SPD, sold it
PM me for wheeling in and around Northern Illinois
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tps sensor

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