OBD II Code PL120?
01-07-2008, 07:58 AM
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OBD II Code PL120?
1999 4Runner 3.4 liter, intermitently throws a check engine light with a PL-120 code. The truck runs fine. When the CEL comes on I reset it and it seems to be fine but in a week or so the CEL comes on again. Other than the intermittent CEL the truck runs fine and just passed smog.
Any ideas on what part/ sensor is going bad?
Thanks.
Any ideas on what part/ sensor is going bad?
Thanks.
01-07-2008, 08:04 AM
#2
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Your code is P0120 and there's plenty of info on that one.
Just do a quick search and you'll find copious amounts of reading material.
https://www.yotatech.com/search.php?searchid=4126832
Just do a quick search and you'll find copious amounts of reading material.
https://www.yotatech.com/search.php?searchid=4126832
Last edited by MTL_4runner; 01-07-2008 at 08:05 AM.
01-07-2008, 10:45 AM
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Just had the same problem on my 01. While it could be a hort in the TPS circuit, more than likely the TPS needs to be replaced.
You can get them for anything from around $40 online to $80 + locally (my experience). Not sure what the dealership gets for them.
You can get them for anything from around $40 online to $80 + locally (my experience). Not sure what the dealership gets for them.
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01-07-2008, 11:01 AM
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Thanks. After doing some research I believe it is the TPS which is a relatively inexpensive part. The vehicle only has ~90k on it but it is 8 years old so I guess I shouldnt be too surprised a potentiometer is wearing out.
01-07-2008, 11:03 AM
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There is no damage to any of the wire loom and its all 100% stock so I too am assuming its the TPS that is wearing out.
Thanks
01-22-2008, 01:16 PM
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figured it was better to bump a thread than make a new one...
My engine threw this code PO120 (and behaves as it should with a TPS malfunction), so I want to swap it out... but my question is: where is the TPS sensor in the 3rd gen? I searched but didn't see much, so can anyone give me an easy answer? Thanks
My engine threw this code PO120 (and behaves as it should with a TPS malfunction), so I want to swap it out... but my question is: where is the TPS sensor in the 3rd gen? I searched but didn't see much, so can anyone give me an easy answer? Thanks
01-22-2008, 05:25 PM
#11
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figured it was better to bump a thread than make a new one...
My engine threw this code PO120 (and behaves as it should with a TPS malfunction), so I want to swap it out... but my question is: where is the TPS sensor in the 3rd gen? I searched but didn't see much, so can anyone give me an easy answer? Thanks
My engine threw this code PO120 (and behaves as it should with a TPS malfunction), so I want to swap it out... but my question is: where is the TPS sensor in the 3rd gen? I searched but didn't see much, so can anyone give me an easy answer? Thanks
See attached pic.
Last edited by MTL_4runner; 01-22-2008 at 05:26 PM.
01-28-2008, 09:44 AM
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Update to the thread...
I replaced the TPS with a new one which was very simple to do. I verified before removal and after re-installation that the TPS settings were the same with my Scangauge II (10 - 75), although there is no adjustment of this sensor for this year vehicle. The CEL has not appeared since and everything seems to be working fine. I would say time will tell as the CEL only came on very intermittently before, but I think this fix has solved the problem.
I replaced the TPS with a new one which was very simple to do. I verified before removal and after re-installation that the TPS settings were the same with my Scangauge II (10 - 75), although there is no adjustment of this sensor for this year vehicle. The CEL has not appeared since and everything seems to be working fine. I would say time will tell as the CEL only came on very intermittently before, but I think this fix has solved the problem.
01-28-2008, 01:48 PM
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Update to the thread...
I replaced the TPS with a new one which was very simple to do. I verified before removal and after re-installation that the TPS settings were the same with my Scangauge II (10 - 75), although there is no adjustment of this sensor for this year vehicle. The CEL has not appeared since and everything seems to be working fine. I would say time will tell as the CEL only came on very intermittently before, but I think this fix has solved the problem.
I replaced the TPS with a new one which was very simple to do. I verified before removal and after re-installation that the TPS settings were the same with my Scangauge II (10 - 75), although there is no adjustment of this sensor for this year vehicle. The CEL has not appeared since and everything seems to be working fine. I would say time will tell as the CEL only came on very intermittently before, but I think this fix has solved the problem.
02-06-2008, 05:37 PM
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i had this code to show up in my 98 4runner and it comes and goes like once a month...however, i never notice any difference in how the truck/engine actually perform...
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