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Old 09-11-2014, 08:21 AM   #1
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Angry Engine light codes PO491 and492.

I got a check engine light this morning
Had Advanced Auto pull the codes.

Codes are PO 491 and 492.

Can anyone give me a idea what would cause
These. And what items do I check or replace
To fit the problem.

Is there anyway to reset the computer?
No change in operation. No misses
Or backfires still runs smooth.

Searched did not find any info.

Thanks in advance for the help

Bill and Jinx
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Old 09-11-2014, 09:53 AM   #2
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My first guess would be to look at this from Rennlist:
P0491 and PO492 - **SOLVED!** - Rennlist Discussion Forums

good luck .. let us know if it works?
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Old 09-11-2014, 11:42 AM   #3
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Bill took the Pcar to our indepent guy
This morning. He reset the light restarted
The light stayed off. I hope I did not just
Jinx myself.
Jinx
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Last edited by Jinx; 09-12-2014 at 11:34 AM.
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Old 09-11-2014, 07:56 PM   #4
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If the independent guy use a reset tool to turn off the light, it will come back...You need to find out the real problem...

The codes are for the secondary air injection systems and the 491 and 492 are for banks 1 and 2.

There are a few things to inspect when this code comes up. The first is to inspect the system checking for a proper seal. Check the connection pipes and hoses between the Secondary Air System, (AIR), pump motor and the combination valves for a proper seal. See FIG 162 for the pump location.
The solenoid for the system may be bad but you need a special tool to test it so if you go through all the suggestions I give you as it is something you may have to have a repair shop adress.

Then, you can check the fuse for the air system, see FIG 194 Position B, to see if it is okay. Another FIG 195, shows the position of fuse S234 which is in the number 34 position in the fuse box. I hope the included diagrams, (FIGs), help you to determine if there is anything you can do.
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Old 09-12-2014, 11:30 AM   #5
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Thumbs up Thank you

Guesswecan777. Thank You.
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