O2 Sensor bad without check Engine light? - DodgeForum.com



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O2 Sensor bad without check Engine light?

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Old 04-19-2007, 10:28 PM
dirtrider00 dirtrider00 is offline
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Default O2 Sensor bad without check Engine light?

Hey, I am getting around 14mpg city driving with my 2002 4X4 V6 auto Dakota. I have no check engine light on. Recently my transmission modules fried and the dealer replaced them so the truck runs great. I don't drive excessively aggressive and rarely go offroad. The truck has 45K miles and I am wondering if perhaps an O2 sensor malfunction is causing this less than par mileage.

Thanks

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Old 04-19-2007, 10:43 PM
f0x672 f0x672 is offline
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Vehicle: 2001 Dakota 3.9l V6 Auto 4x4
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Default RE: O2 Sensor bad without check Engine light?

yea the 02 sensors are common to become crap and not throw a code.. i dont know why, you could go under there and pop them off, clean them with electrical contact cleaner, temporary fix versus the correct new ones which aren't cheap.. have fun
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Old 04-19-2007, 11:18 PM
imnothot02 imnothot02 is offline
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Default RE: O2 Sensor bad without check Engine light?

or test them w/ a meter...
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Old 04-20-2007, 01:17 AM
dirtrider00 dirtrider00 is offline
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Default RE: O2 Sensor bad without check Engine light?

can you elaborate on the meter?
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Old 04-20-2007, 01:32 AM
imnothot02 imnothot02 is offline
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Default RE: O2 Sensor bad without check Engine light?

htis is easier... http://www.gnttype.org/techarea/ecms...O2sensors.html
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Old 04-22-2007, 12:58 AM
varsis varsis is offline
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Default RE: O2 Sensor bad without check Engine light?

I bought a new one for 75 bucks Canadian and it increased my millage significantly. from about 8.4 to 20mpg.
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Old 04-24-2007, 02:47 PM
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Rakaric Rakaric is offline
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Vehicle: Dakota 4x4 4.7L V8
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Default RE: O2 Sensor bad without check Engine light?

wow..I never even saw that possible. Well then...I know what I have to do when I get my truck back from the shop...
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Old 04-24-2007, 03:14 PM
User User is offline
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Default RE: O2 Sensor bad without check Engine light?

I went from 14mpg to 14mpg when i changed mine.. WOOT!
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Old 04-24-2007, 04:10 PM
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Rakaric Rakaric is offline
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Default RE: O2 Sensor bad without check Engine light?

hahaha well I'm at 10MPG and less, so hopefully it'll go up to at least 13.
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Old 04-24-2007, 07:50 PM
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jonnymagnum jonnymagnum is offline
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Default RE: O2 Sensor bad without check Engine light?

I went from 14mpg back up to 20-21mpg when I changed mine
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