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post #1 of 4 Old 02-13-2012, 04:24 PM Thread Starter
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Check Engine Light Help

Hello. Newbie here. I have searched the posts but cant find much related to my problem.A month ago I bought 1999 Honda Accord LX coupe (4 cyl., Automatic,104K miles, no mods, no warranty from dealer) that keeps throwing codes P0171 and P0170. It runs like normal and i have not notices a drop in the MPG. When I clear the code it stays out for a few days and then pops back on and then stays on. I cannot afford to throw money at it and able to do most of work myself if I can get some idea of what can be the cause of the problem. Any help would be greatly appreciated!!!

P.S. I do not think it would be an O2 sensor because it seem like a brand new sensor has been installed.

Thanks in advance,

DanRTG

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post #2 of 4 Old 02-13-2012, 06:23 PM
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P0171 is a fuel system lean code. Could be caused by several things including fuel pressure too low, vacuum leak, exhaust leak, dirty injectors, O2 sensor, etc.


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post #3 of 4 Old 02-14-2012, 06:28 AM
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Quote:
Originally Posted by DanRTG View Post
Hello. Newbie here. I have searched the posts but cant find much related to my problem.A month ago I bought 1999 Honda Accord LX coupe (4 cyl., Automatic,104K miles, no mods, no warranty from dealer) that keeps throwing codes P0171 and P0170. It runs like normal and i have not notices a drop in the MPG. When I clear the code it stays out for a few days and then pops back on and then stays on. I cannot afford to throw money at it and able to do most of work myself if I can get some idea of what can be the cause of the problem. Any help would be greatly appreciated!!!

P.S. I do not think it would be an O2 sensor because it seem like a brand new sensor has been installed.

Thanks in advance,

DanRTG


Not sure if you have a place like Autozone or Advance Auto, but they'll pull your codes for free and tell you what's wrong. You've obviously gotten codes somehow, I just feel like they were a little more complete with me...maybe it was just the people in particular?

You do have 2 O2 sensors though. One is on the exhaust manifold and one is after the catalytic converter.

FWIW...on my '08, I threw a code that could've been read as O2 sensors, but it ended up being a spider's nest in the emissions (evap?). They charged me $3 to put a small spring in a tube that would prevent the buggers from getting back in there. Nearly positive I even read about it in here.

So maybe it won't be $$$$ at all!
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post #4 of 4 Old 02-14-2012, 08:34 AM
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I had a lean fuel code on my 99 Accord LX coupe I4. Around 90k or so. There's a tsb for the fuel pressure regulator which fixed the problem.
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