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Old 02-28-2012, 09:52 AM   #1
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1997 wrangler ,need help please!!!

Hey! ,I'm new to this forum and to jeeps ,I've purchased a 1997 jeep wrangler about 2 weeks ago (2.5L 4 cylinder) ,after purchasing it in 3 days the check eninge light came on,took it to a close by shop and read the codes . It's reading P0171=system too lean (Bank 1) and P0131= O2 sensor circuit low voltage (Bank 1,Sensor 1).
After a little research I saw that people are saying to replace the MAP sensor so I did as well as the O2 sensor ,I reset the light,after like 2 hours it came back on! :/ reading the same codes.I really don't know what to do at this point,any help will be really appreciated! Thanks!

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Old 02-28-2012, 10:13 AM   #2
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If you replaced the 02 sensor up by the engine and not by the one in the catalytic converter, I would next check the exhaust manifold for a leak.

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Old 02-28-2012, 02:15 PM   #3
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check the forum and see if you can find the specific location of bank one, if thats not the sensor you replaced do so, and also check the voltage to that sensor, wiring harness around it and whatnot. see if there is something that could be causing a false trigger.
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Old 02-28-2012, 02:19 PM   #4
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did some quick looking and it looks like...
(Bank 1, Sensor 1) is the one closest to the exhaust manifold before the catalytic converter, and (Bank 1, Sensor 2) is after the converter.
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Old 02-29-2012, 11:36 AM   #5
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The the one I replaced is the one before the catalytic coverter,I'm gonna check the voltage today,by any chance do you know how much voltage it should be reading?!! And I really do appreciate the help!
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