4.2L O2 sensor location - Ford Truck Enthusiasts Forums



4.2L O2 sensor location

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Old 10-19-2010, 08:52 AM
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4.2L O2 sensor location

Hi Folks
Have fault in bank2 sensor 1 (upstream?) Mechanic that inspected it said bank 2 is driver side and bank 1 is passenger side of vehicle. Parts store guy says it's the opposite. So who's right? Thanks for the help
kbgrn150
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Old 10-19-2010, 02:12 PM
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Unless I am badly mistaken, Bank 1 is the side with #1 cylinder.
In the case of the 4.2, #1 cylinder is the front cylinder on the passenger side.
To verify, you can always look at the coil pack, find the #1 wire (connections are numbered with small numbers molded into coil pack assembly) and follow the #1 wire to the #1 cylinder.
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Old 11-11-2010, 11:07 PM
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Bank 2 sensor 1 was easiest for me to reach through the drivers side (left) wheelwell by turning the wheel full lock left.
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Old 11-12-2010, 06:32 PM
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Replace both sides.
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Old 11-13-2010, 11:27 AM
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Originally Posted by BlueOvalFitter View Post
Replace both sides.
If money's tight, all you need to replace is the one throwing a code. I would bet that is why he wanted to know which side is which.
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Old 12-19-2010, 12:41 PM
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help me

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Originally Posted by kbgrn150 View Post
Hi Folks
Have fault in bank2 sensor 1 (upstream?) Mechanic that inspected it said bank 2 is driver side and bank 1 is passenger side of vehicle. Parts store guy says it's the opposite. So who's right? Thanks for the help
kbgrn150
howdy ,did u find out which one it is ? my trucks outside now n i dont know which one . ! .ive got the sensor and the socket . im learning how to do this stuff myself id like to believe ur mechanic ! but its looks like 2 ,one on each side 2003 f150 xl 4.2 6cyl thx frnd .....mike
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Old 12-19-2010, 12:45 PM
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Always replace 02 sensors in pairs.(Unless your vehicle only has one)
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