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09-28-2007, 11:04 AM
| #1 |
| Senior Member Join Date: Dec 2005
Posts: 307
 | PO300 Code My 96 c10 just gave me a PO300 code biefly and when it was reset it hasnt come back on. This was the same code it gave me before I replaced a the cat.......at the time it also gave me PO420 (I believe). Well, my question is if there is a common problem in these vehicles that throw off the PO300 code. About 6k miles ago, I replaced ALL the ignition parts except the O2 sensor. |
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09-28-2007, 11:38 AM
| #2 |
| Senior Member  Join Date: Apr 2007 Location: Adrian, MI.
Posts: 155
|  It sucks! It sucks but I think you will have to replace the O2 sensors. I had the same problem about 1k ago. The only way around it was to actually FIX the problem. Retarded right? I know! Who would ever think that to get rid of a warning light, that you would actually have to fix the problem. It kinda sucks because my truck had 5 snsors and 4 of them needed replacing. Unfortunately, they were like $80 a piece. 
__________________ "You can polish a piece of junk all you want, but in the end, all you're left with is shiny junk." |
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09-30-2007, 03:47 PM
| #3 |
| Senior Member  Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON
Posts: 644
| P0420 is cat efficiency code, so it may mean that the cat is losing effectiveness or an o2 sensor may be giving an off reading, but not so far off that it is completely gone
__________________ im a straight shooter with upper management written all over me |
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10-01-2007, 10:32 AM
| #4 |
| Senior Member Join Date: Dec 2005
Posts: 307
| Well, I replaced the Cat and the PO420 code is gone. All I am left is with the PO300 code. Is there a sparky in this forum that can tell me how to test the O2 sensor? |
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10-01-2007, 11:16 AM
| #5 |
| Senior Member Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON
Posts: 644
| if you have a volt meter, you can hook it up and see if it is generating voltage... it should be constantly fluctuating, if it is before the cat it should be fluctuating very drastically, if after the cat it should be slower. the best way to test it is with an oscilloscope, but not many people have one of these kickin around
__________________ im a straight shooter with upper management written all over me |
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10-02-2007, 10:40 AM
| #6 | |
| Senior Member Join Date: Dec 2005
Posts: 307
| I suppose I dont know how these sensors work. I was under the impression that they worked similar to thermocouples???? I can get my hands on an oscilloscope. Do you know what type of readings should we get? Why such fluctuating readings though? Quote:
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10-02-2007, 11:34 AM
| #7 |
| Senior Member  Join Date: Sep 2004 Location: Sac-Town, Cali
Posts: 1,711
| What engine is in your truck?
__________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD. ************************************** A fact of life: After Monday and Tuesday, even the calendar says W T F..... |
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10-03-2007, 06:35 PM
| #8 |
| Senior Member  Join Date: Nov 2006
Posts: 106
| what would the engine have 2 do with a cat related code?
__________________ Ride Til I Die |
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10-04-2007, 08:24 AM
| #9 | |
| Senior Member Join Date: Sep 2004 Location: Sac-Town, Cali
Posts: 1,711
| Quote:
__________________ '93 Isuzu Amigo, Toyota Axles/Tcase/Drivelines, 35" MTR's. '01 Pathy, DD. ************************************** A fact of life: After Monday and Tuesday, even the calendar says W T F..... | |
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10-05-2007, 09:36 AM
| #10 |
| Senior Member Join Date: Dec 2005
Posts: 307
| It Is The 5.0, 1996, C10 - 97 Sierra - The Auto Part Stores Ask Engine Size When You Buy Brake Pads.........so Dont Be Surprised When Someone Asks For Engine Size To Do A Code Diagnosis.... |
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