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Old 04-29-2009, 07:41 PM   #1 (permalink)
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engine light code P0120

I have a 99' 4Runner with the 5VZ FE & just recently my check engine light came on but it would come on & off randomly. My buddy used his scanner & came up with this code: "P0120 throttle position sensor A circut". The next day I took it to my local Toyota mechanic & he told me to get some throttle body cleaner & an old toothbrush & clean the carbon deposits inside the throttle body because it may be dirty & it may fix the problem. Has anyone had this problem before & attempted to clean the inside of the throttle body? The reason why I'm asking is because I want to know if the carbon deposits affect the TPS sensor & if cleaning it cures the problem? I want to hear your inputs before I spend $130 for a new TPS sensor from Toyota!
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Old 04-29-2009, 08:09 PM   #2 (permalink)
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dude, don't ever spend that much for a part like a TPS from Toyota...i had the same code and picked up a new TPS from autozone for $60, and it's fixed all my problems and comes with a nice warranty...save yourself the time of cleaning and just get a new one...trust me
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Old 04-29-2009, 11:11 PM   #3 (permalink)
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Quote:
Originally Posted by mikes19984x4 View Post
dude, don't ever spend that much for a part like a TPS from Toyota...i had the same code and picked up a new TPS from autozone for $60, and it's fixed all my problems and comes with a nice warranty...save yourself the time of cleaning and just get a new one...trust me

Thanks for the advice Mike! Well my mechanic told me that he did it to a few other toyota cars & it seemed to work. But he also told me to just try it out first to see if the problem goes away before I start spending money. What is the make of your aftermarket TPS so I can go to my local parts store to see if they carry it because in up here in Canada we don't have an Autozone just NAPA. Because I'm afraid they might tell me that they don't carry it & it's only an OEM part! Do have the part # by any chance?
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Old 04-30-2009, 08:39 AM   #4 (permalink)
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Originally Posted by dR. hOOK View Post
Thanks for the advice Mike! Well my mechanic told me that he did it to a few other toyota cars & it seemed to work. But he also told me to just try it out first to see if the problem goes away before I start spending money. What is the make of your aftermarket TPS so I can go to my local parts store to see if they carry it because in up here in Canada we don't have an Autozone just NAPA. Because I'm afraid they might tell me that they don't carry it & it's only an OEM part! Do have the part # by any chance?
it was just the Duralast brand from Autozone, part # TPS482 as stated on their website and comes with a two year warranty...and it also looked exactly like the one that i pulled off the truck as far as markings, colors, and numbers/letters...and my bad on the price, as it was really only $49.99

edit: OEM Number: 89452- 35020; 89452- 35100
this was also listed on their website under the Duralast part number...just thought i'd post it
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Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
More mods to come...

Last edited by mikes19984x4; 04-30-2009 at 08:40 AM.
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Old 04-30-2009, 09:38 AM   #5 (permalink)
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Originally Posted by mikes19984x4 View Post
it was just the Duralast brand from Autozone, part # TPS482 as stated on their website and comes with a two year warranty...and it also looked exactly like the one that i pulled off the truck as far as markings, colors, and numbers/letters...and my bad on the price, as it was really only $49.99

edit: OEM Number: 89452- 35020; 89452- 35100
this was also listed on their website under the Duralast part number...just thought i'd post it

Well thanks again Mike that saved me about $80 buying from the dealer!
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Old 04-30-2009, 10:22 AM   #6 (permalink)
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Let us know how long it lasts....
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Old 05-01-2009, 06:33 AM   #7 (permalink)
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Well thanks again Mike that saved me about $80 buying from the dealer!
no problem...and it's been right at 6 months now since i've bought it, which isn't that long but still no CELs being thrown, so i think the part is of good quality
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Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
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Old 06-21-2009, 04:22 PM   #8 (permalink)
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Not wasting your time and just buying the sensor from autozone is the best way to go, but just thought i would throw out there i have had that code as well as having my IAC valve stick closed while driving. I removed my throttle body and cleaned every thing out with throttle body cleaner and have not had a problem since. That was last summer.
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Old 12-13-2009, 05:39 PM   #9 (permalink)
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mine just came on a few weeks ago it runs the same no problems idle is a little high around 1100 i cleaned the tb guess i just need to replace the sensor ?
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Old 12-14-2009, 07:34 AM   #10 (permalink)
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Just for fun I checked NAPA--they list two: an Echlin for $53 and a Delphi for about $70. So these are pretty easy to find. I use NAPA because they are two miles way, Autozone is about 15.
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Old 12-14-2009, 08:17 PM   #11 (permalink)
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tps sensor

hey there jusst replace mine two months ago i used a standard brand made in japan part #091769 522469 I think it cost me about 110 canadian
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Old 12-15-2009, 12:31 AM   #12 (permalink)
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if ur throttle body is dirty, you should still clean it. It could lead to hesitation. seems a bit foolish to just throw parts at it rather than spend 10 minutes and a $4.00 bottle of cleaner to try and see if ti fixes it. If not, oh well you now have a clean throttle body if it does work then good!
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Old 12-16-2009, 06:52 PM   #13 (permalink)
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lol your never gonna guess but i guess my truck knows im poor and poof like magic no more cel been 3days
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Old 12-20-2013, 09:23 PM   #14 (permalink)
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hello, I'm getting a check engine light on and the code of p0120 !! is the tps sensor or throttle switch easy to clean and how hard to remove? I HAVE A 1999 4RUNNER thanks and have a safe holiday
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Old 12-21-2013, 02:08 PM   #15 (permalink)
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Get the Toyota part number. A little time on the internet will cross reference will the OE part number with the Denso part number. Then order the Denso part from Ebay.

I cringe when I hear of Autozone or NAPA parts being installed on a Toyota engine.

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Old 12-22-2013, 05:26 AM   #16 (permalink)
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My 99 kept randomly throwing that code. Eventually we swapped it with the TPS on my wife's 96. The 96 doesn't seem to care the slightest (never throws a code), and the 96's TPS works perfectly on the 99.
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Old 02-07-2014, 05:45 PM   #17 (permalink)
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I just had the P0120 code and bought a TPS at Autozone. Cleared the code and it has not returned after a few hundred miles, so that was probably it.


It's not the most sophisticated part. An Autozone TPS seems about as risky as Delco wiper blades. JMO.


p.s. Thanks folks for the diagnostic help.

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Old 02-19-2014, 12:58 PM   #18 (permalink)
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Error Code: P0120 (Throttle/Pedal Position Sensor/Switch ”A” Circuit)
Check the following:
- ECTS Fuse.
- Wiring harness.
- Throttle control motor and sensor
- ECM
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Old 02-19-2014, 12:58 PM
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