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Old 11-19-2009, 12:35 PM   #1 (permalink)
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Throttle Position Sensor

I have a 2007 Impala SS. Where is the Throttle Position Sensor located? I need to replace this and need to know where it is located. I am getting a Check Engine Light Code P0121.

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Old 11-18-2013, 06:21 PM   #2 (permalink)
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Originally Posted by csherrill View Post
I have a 2007 Impala SS. Where is the Throttle Position Sensor located? I need to replace this and need to know where it is located. I am getting a Check Engine Light Code P0121.

I have the same thing going on with a 2008. Anyone with this wisdom out there please post.

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Old 11-18-2013, 06:25 PM   #3 (permalink)
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Open the hood and locate the throttle cable.. follow it to the twisty thingy... thats your TPS.

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Old 11-18-2013, 08:47 PM   #4 (permalink)
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There should be one on the pedal as well since it is DBW.

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Old 11-18-2013, 08:49 PM   #5 (permalink)
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a 2007 is dbw?

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Old 11-18-2013, 08:57 PM   #6 (permalink)
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DBW "Drive By Wire" yes, not DBC "Drive By Cable".

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2001 Impala 9c1: SLP CAI: L67 coils:PRJ wires:ZZP volt booster:Fuel pump rewire:Trans cooler:HD diff/axle:Home made Shift kit:Drilled 180* Tstat:Flipped MM's:GTP dual exhaust:Aero force scan gauge:Whelen 90watt Strobes front/back wig wag reverse lights:Whelen air horn:Wig wag headlights.
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Old 11-18-2013, 09:37 PM   #7 (permalink)
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Yeah, DBW has been around for some time now. Even my 2005 Buick LaCrosse is DBW... To be perfectly honest, I kind of prefer the older cable-based throttles though! Sometimes, the DBW can make the throttle seem "disconnected" - maybe because it is! :-)

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Old 11-19-2013, 05:44 PM   #8 (permalink)
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A P0121 is set when The ECM detects that the airflow rate is greater than the calculated airflow for greater than 0.2 second.
You can try to clean the throttle body and then do a idle learn reset (you will need a Tech2 for this) and see if the code comes back. Or replace the throttle body and do a Idle learn reset (with a Tech2).
For those who are wondering the TPS is located inside that big black plastic cover on the throttle body that the electrical connector plugs into. For the correlation code, DTC P2135, this piece is replaceable separately from the throttle body.

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