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P0172 Engine Code - What to check?

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Old 03-23-2006, 08:05 AM
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Default P0172 Engine Code - What to check?

'00 Civic threw this code - P0172. Any thoughts on what to check?

Thanks.
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Old 03-23-2006, 09:10 AM
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Default Re: P0172 Engine Code - What to check? (bucky4444)

What's the code actually for?
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Old 03-23-2006, 11:14 AM
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Default Re: P0172 Engine Code - What to check? (EE_Chris)

Fuel trim problem..

If you have a fuel pressure regulator, take it off.. If you have a AFC, Set it to "0"..

basically the ECU cannot completely control the ammount of fuel being given to the engine, either because fuel pressure is too high from a kinked return line in the engine compartment, or under the car.. or POSSIBLY a bad O2 sensor sometimes has that affect..

Check for defects in the fuel return line if everything is stock, and if your O2 sensor has alot of mileage on it, it'd probably be a good idea to replace it.. Especially if you've used race fuel at one time or another..
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Old 03-23-2006, 12:06 PM
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Thanks Gadget for the reply. The fuel line looks OK and I don't have a regulator, so I'm guessing it's the O2 sensor. The car has 139k on it.

BTW what's an AFC?
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Old 03-23-2006, 01:00 PM
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Default Re: (bucky4444)

it's an electronic piggyback device that hacks the signals going to the ECU that allows you to change the normal fuel/Vtec settings from stock.. It basically fools the ECU into operating differently..

It's a piece of crap and HIGHLY reccomend against using one.. nothing beats a couple hundred bucks on a dyno tune..
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