Question about 1999 Isuzu Rodeo

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I have a 1999 isuzu rodeo. I got a new throttle position sensor installed by a mechanic, but po121 code still comes up. What could it be?

Bought new and had mechanic install

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1 Answer

Take it back

Would appear the vehicle was not kept long
enough & no road test to verify the work done

I bet they just threw a sensor at a code & never tried
to find out why you had the code

Now your out some money & back to the beginning

You got a code,bought the part,asked they install it

Wrong approach & the shop knows that

No attempt to find the problem,just did as you asked

Wrong shop you went to

Posted on Nov 25, 2014

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1999 chevy siverado 4.8l diagnostic tester says i have po300,po121,po122,po440,p0449,po452 and gm p1639

Codes 121 and 122 are for the throttle position sensor circuit.
Code 400 is EGR and codes 449 and 452 are for the EVAP system.
Code 1639 is for a problem with the 5 volt reference circuit from the engine computer.
The throttle position sensor could be failing which could prevent the gas pedal from working. And the 5 volt reference problem could shut down the computer which would kill the engine. EGR is an emissions component and EVAP is the system that vents gas fumes from the gas tank.
Codes are only a guide for a mechanic to troubleshoot the circuits involved. They do not mean a component is faulty.

Jan 22, 2014 | Chevrolet Cars & Trucks

1 Answer

Izusu rodeo woulnt start. Mechanic replace starter. Now it is running wide open. It fine while driving but when coming to a stop it just revs super high. Any thoughts?

Check that the throttle cable has been correctly installed and is not jammed at full throttle . Run fault codes to check for throttle position sensor fault. Reset the CPU using a code reader as by disconnecting the batter to replace the starter the CPU program may have become corrupted and needs resettiing

Oct 26, 2013 | Isuzu Rodeo Cars & Trucks

1 Answer

My 1999 rodeo has a throttle position sensor issue .the truck is staying at a high idle i brought and instaled a new sensor it didnt fix the problem how do i resolve? I had a print out done it said open...

There is a mechanism called the Idle Air Control Valve that is bolted to the throttle body with two bolts. It has an electrical connector plugged into the front of it. When that unit started going defective on my 97 Rodeo, sometimes the car would idle at 2500 RPM when the clutch was pushed in. Other times it stall when the clutch was pushed in. At the time (5 years ago) it cost $41 from Autozone to replace.

Mar 17, 2011 | 1999 Isuzu Rodeo

1 Answer

2000 Isuzu Rodeo LS ~ check engine & reduced power lights

Do you know the OBDII codes? I just had to replace my Mass Air Flow sensor, it seems to have fixed my problems. But check the error codes.

Mar 30, 2010 | 2000 Isuzu Rodeo

1 Answer

The "engine power is reduced" light comes on

po455 is Probable Cause[s]

1. Defective, loose or missing fuel cap
2. EVAP canister broke, hose cracked or not connected
3. Purge or vent solenoid defective
4 . Vacuum leak at engine po121 code po121 means Throttle Position Sensor/Switch A Circuit Range/Performance Problem . it is usually indicative of a faulty throttle position sensor or faulty wiring harness in the engine bay.

Feb 27, 2010 | 2006 Chevrolet Impala

4 Answers


I just got one today with the same problem; both lights and code p1290 hard to start and once started stayed at idle with no accelleration . If you have already fixed it would be nice to share the info. If not already done ill tell you when i fix this one.

Sep 18, 2009 | 2003 Isuzu Rodeo

1 Answer

Motor idling to high in my 1999 rodeo . changed

It sounds like it might be your throttle position sensor. Is your check engine lite on?

Aug 05, 2009 | 1999 Isuzu Rodeo

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