Car Repair Question

Old 07-19-2017, 04:54 PM
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Default Car Repair Question

My 2001 Suburban check engine light came on 2 weeks ago so I looked online and saw suggestions of a possibly loose gas cap. I tightened the gas cap and 5 minutes later the light went off.

Last week the light came back on so I plugged in my code reader and got P0327 (knock sensor circuit low input) error code. I ordered the parts and they arrived just in time for the light to go off . The light has now been off for about 500 miles (~1000 miles since light originally went on).

My question is whether I should replace the sensors or not? The shop wants $1000+ to do the repair and I got the AC Delco parts for about $200, but this repair requires full removal of the intake manifold. I'm ok with doing it, but I don't want to go through all the trouble and time if it's not necessary (220k miles on the burb). I haven't noticed any signs of hesitation while driving. Is it too risky to ignore the problem even if the check engine light remains OFF?
Old 07-19-2017, 04:59 PM
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If the light is gone I wouldn't bother paying $1000 to get it done.

However it is a very easy DIY project. I've probably done 6+ sets now - common issue with GM LS motors
Old 07-19-2017, 05:06 PM
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Gm Master Auto tech here. It is a pretty common issue and with a few tools and a couple hours if your new to the work and follow the very well laid out instructions in the article link the other person posted and you will be well on your way. if you have any questions I would be happy to help.
Old 07-19-2017, 07:58 PM
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My check engine light has been on for years on my 2002 Avalanche, same error code. Maybe not wise, but I haven't noticed any issues so I let it ride.
Old 07-20-2017, 05:25 AM
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fairly easy job if your mechanically inclined
what gas are you running in it??
Old 07-20-2017, 05:35 AM
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RE: the gas cap thing, I recommend replacing the gas cap or at least the sealing O-ring. The sealing O-ring is 15 years old and they don't last forever.
Old 07-20-2017, 05:53 AM
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A batch of bad gas can also cause the knock sensor to go off. At least cycle another tank of gas through before throwing parts at it.
Old 07-20-2017, 06:04 AM
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Id Be returning the part until it happens again.
Old 07-20-2017, 05:12 PM
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labor is under 3 hours to replace knock sensors. make sure you replace the oring gaskets

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