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Straight back from the radiator cap, you'll see where the large tube from the air filter enters the throttle body, top front center of the engine. The throttle position sensor is bolted to the right side of the throttle body where this air feed attaches. There's a set of wires plugged into it at the top. The throttle position sensor is a smallish (1 1/4" x 2 1/2"?) plastic component and is attached with two Torx head bolts, size T25.

To get at these, you'll need to unclip the plug that goes into the TPS as well as the two other plugs on the same bundle of wires. This comes from the right; the first plug on the line clips onto the air mass sensor (in the tube from the air cleaner), the second goes to the throttle position sensor, and the last one crosses the front of the throttle body and plugs into a sensor on the other side. Unclip all three and bend the wire back out of the way to the right so you can get at the two bolts from the right side. One is on the front side of the TPS, the other is on the bottom.

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Q: Where is the Throttle Position Sensor on a 1999 Honda Passport?
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