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Bucking on highway 40mph, CEL always illuminated pulled codes p300 through p308

   
Old Jan 5, 2022 | 01:07 PM
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Originally Posted by true blue
Check to see if the 'cat' is clogged. Sounds like what you're describing. Remove the upstream o2 sensor n see if the problem changes and/or do an exhaust pressure check.
How do I remove the O2 sensor or do an exhaust check ? Is this something I can do myself or does it have to be taken to a shop ?

It doesn't do it in cold while in 'P' seems to idle fine.
 
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Old Jan 5, 2022 | 01:49 PM
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If you have the right size wrench, (or, a pipe wrench....) you can pull the O2 sensor yourself. They tend to be stubborn though..... Remove it, go for a drive. Run better?? (It'll be loud....)
 
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Old Jan 5, 2022 | 05:44 PM
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Originally Posted by HeyYou
If you have the right size wrench, (or, a pipe wrench....) you can pull the O2 sensor yourself. They tend to be stubborn though..... Remove it, go for a drive. Run better?? (It'll be loud....)
When I remove the O2 sensor, how will I know if the CAT is clogged ?
 
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Old Jan 5, 2022 | 09:04 PM
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The truck will run better. More power off idle, etc, as it isn't being choked by a clogged cat.
 
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Old Jan 6, 2022 | 10:17 PM
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Originally Posted by HeyYou
The truck will run better. More power off idle, etc, as it isn't being choked by a clogged cat.
Ok great, this will be the next test.. One more thing, will removing the O2 sensor cause a check engine light ?
 
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Old Jan 6, 2022 | 11:12 PM
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Originally Posted by Haulmonster58
Ok great, this will be the next test.. One more thing, will removing the O2 sensor cause a check engine light ?
Almost surely, yes
 
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