1998 Subaru Outback check engine light

Tiny
55JOHN1955
  • MEMBER
  • 1998 SUBARU OUTBACK
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 130,000 MILES
My subaru mil came on I had it checked and the codes were p0170 p0301 p0302 I know what the codes are fuel trim & misfire 1& 3 clys I changed plugs & wires fuel filter pvc cleaned maf I reset the codes the car would run ok for a day or so and than it would ilde funny it hastertate when you step on the gas with lost of power if you pump the pedel it will go and run ok until the next time it doesnt do it all the time but it set off the codes any ideas
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Saturday, February 7th, 2009 AT 10:55 AM

11 Replies

Tiny
ZACKMAN
  • MEMBER


http://www.2carpros.com/forum/automotive_pictures/55316_P0170_1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_P0170_2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_P0170_3_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_P0170_4_1.jpg



[quote]p0301 p0302 i know what the codes are misfire 1& 3. P0302 is for cylinder #2, so are you misfiring at cylinder 3 or cylinder 2?


http://www.2carpros.com/forum/automotive_pictures/55316_p0301_1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/55316_p0301_2_1.jpg

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Sunday, February 8th, 2009 AT 1:30 AM
Tiny
55JOHN1955
  • MEMBER
I checked exhaust no leaks I checked for intake leaks didnt find any the engine misfire on 1& 3 clys I erased the codes and it didnt come back over 600 miles but no 1 misfired after engine ran rough with no power and than the car wouldnt go so I checked the fuel pressure it readed 24 lbs with hose connected and 24 lbs with disconnected no change I think the misfiring might be caused by the engine hesitating and loss of power when you step on the gas and it would go what do you think thanks
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Monday, February 16th, 2009 AT 2:41 PM
Tiny
ZACKMAN
  • MEMBER
If you look at step 5 for code P0170, if the fuel pressure is too low (disconnected), problem is within improper fuel pump discharge or clogged fuel supply line. So, before you spend money replacing the fuel pump, I would make sure that the line from the fuel pump to fuel filter is not clogged.
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Monday, February 16th, 2009 AT 10:26 PM
Tiny
55JOHN1955
  • MEMBER
Hi zackman

I finally fix the problem I replaced the fuel pump and the car has been running good for 400 miles no hesitating or loss of power no more codes or check engine light thanks for the help in finding the problem but now the catalyst monitor is not ready all the other one are can you tell me how to get it to be ready I have driven on the highway 150 miles slow roads medium speeds short drives
any ideas on how to get it ready only days left for reinspection

thank again john
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Sunday, March 29th, 2009 AT 2:26 PM
Tiny
ZACKMAN
  • MEMBER
Subaru does not provide any info for catalyst readiness. I have no way to tell you how long it will take. You may need to go to your state's DMV, and request for extension. I know CA and UT will give you extension (2 weeks) providing that you pay for the tag plus $10, I would imagine that other states will have similar program.
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Monday, March 30th, 2009 AT 8:55 PM
Tiny
55JOHN1955
  • MEMBER
Well I cant believe it I just cant believe it the catalyst monitor went to ready but quess what the check engine light came back on--- for code p0420 catalyst efficiency below threshold bank 1 (what)
this is the first time for this code I check the exhaust
for leaks no leaks up front-- but have one after catalyst convertor at the flange on the pipe side down stream--- could this have set off this code--- the car was running fine for 2 weeks.I. Am going to change the pipe today
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Tuesday, March 31st, 2009 AT 7:17 AM
Tiny
ZACKMAN
  • MEMBER


http://www.2carpros.com/forum/automotive_pictures/55316_98outbackp0420_2.jpg



That exhaust leak may have caused the code to come on.
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Tuesday, March 31st, 2009 AT 9:46 PM
Tiny
55JOHN1955
  • MEMBER
Hi zackman

I replaced the exhaust pipe behind the rear converter it was broken on the pipe side at the flange. Converter side was ok. (New gasket. New pipe all tight). I cleared the code and I will drive it around. Hope that was it
ill let you know what happen. Thanks again
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Wednesday, April 1st, 2009 AT 7:26 PM
Tiny
ZACKMAN
  • MEMBER
Not a problem. Glad to help.
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Thursday, April 2nd, 2009 AT 10:55 PM
Tiny
55JOHN1955
  • MEMBER
The light came on again code p0420 no other codes---no exhaust leaks ---car runs fine---- what should I do next -- there are two converter on this car -- if the catsalytic is bad do I have to replace both -- if so do you know why

thanks john
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Wednesday, April 8th, 2009 AT 7:54 AM
Tiny
ZACKMAN
  • MEMBER
I am now leaning towards possible bad converters. Especially after the exhaust pipe replacement, you may have to go to a exhaust/muffler specialist (such as Midas) and have them diagnose the code, prior to replacing the cat converters. As the damage was after the rear cat, Subaru recommends replacing both converters. I do not have any explanation for that.
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Wednesday, April 8th, 2009 AT 6:47 PM

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