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Need Help! P0172 code w/ 3 misfire codes
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Old 20 Sep 2011, 03:50 PM   #1 (permalink)
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Need Help! P0172 code w/ 3 misfire codes

I've got a 2002 WRX that is still throwing a P 0172 code and three misfire codes. Replaced the rear O2 sensor, air/fuel ratio sensor and the MAF sensor.
What next????
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Old 20 Sep 2011, 03:55 PM   #2 (permalink)
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Re: Need Help! P0172 code w/ 3 misfire codes

could be coil pack,leads,plug or coolant temp sensor fella....

has it been mapped at all??
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Old 21 Sep 2011, 03:13 AM   #3 (permalink)
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Re: Need Help! P0172 code w/ 3 misfire codes

Please explain mapped.
Today checked vacuum on fuel pressure regulator, it was good.
Still smell gas when driving, sometimes back fires when changing gears, especially 1st to 2nd and 2nd to 3rd. When I come to a stop a big cloud of exhaust comes out the back.It still idles rough in 2nd and 3rd.

Last edited by speedmom50; 21 Sep 2011 at 03:17 AM.
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Old 21 Sep 2011, 03:52 AM   #4 (permalink)
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Re: Need Help! P0172 code w/ 3 misfire codes

Plug a laptop in and check your front 02 is working correctly
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Old 21 Sep 2011, 02:08 PM   #5 (permalink)
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Re: Need Help! P0172 code w/ 3 misfire codes

Bit of long shot. I had numerous misfire codes on my WRX after upping the power. Ran rough and popped on overrun. Reset ECU. OK for a few miles then flashing CEL light again.
Changed plugs coil packs etc. Turned out to be the neutral position switch. (NPS)
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Old 22 Sep 2011, 07:40 PM   #6 (permalink)
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Re: Need Help! P0172 code w/ 3 misfire codes

Spark Plug gap will be worth checking also..
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