Ford F150

1915 FORD F-150
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SAZYKD
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  • 2 POSTS
I have a Ford F150 4.2L 6cyl. with 200,000 miles on it. I have 3 trouble codes which state:"Lack Of Upstream Heated O2 Sensor Switch, Sensor Indicates Lean (bank#1), and System to Lean (bank#1), and System to Lean (bank#2). I am assuming i need to replace my O2 sensor, But, I do not know what
( bank#1) or (bank#2) means.
Can anyone clear this up for me? Thank you in advance. Kimmie
Oct 30, 2007 at 6:25 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
When the 02 sensors don't switch fast enough, it set the code and turns on the MIL, this can happen for bad sensors, or bad gas! Try a tank of 89 octane, get the light turned off and see if it resets, if the light comes back on Bank 1 sensor 1 is the 1st sensor on the #1 cylinder side of the motor, bank 2 is cly #2 side...if you stand at the drivers side at the wheel well and look at the valve covers, the cover that is the most forward is the #1 cyl side!
Oct 30, 2007 at 8:44 AM
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SAZYKD
  • MEMBER
  • 2 POSTS
Thank you Merlin, I"ll try the higher octane gas then reset the computer. And I appriciate you explaining bank1 and bank2 for me also. I'll let you know how I did. I am not a machanic, but I do like to get to know the vehicles that I drive machanically, in case I were to break down on the road, I would like to be able to fix it myself. Independant, or driven, I don't know but it works for me. thank you again.
Kimmie from Cali
Oct 30, 2007 at 10:39 AM
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