Kimmie from Cali
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Kimmie from Cali
<TABLE><TBODY><TR><TD vAlign=top width="100%">Hello,
I have a Ford F-150 4.2L 6cyl with 200,000 miles on it. I have 3 trouble codes which are,
1) System too lean (Bank#1)
2) System too lean (Bank#2)
3) Lack of upstream heated O2 sensor (HO2S11) switch,
Sensor indicates lean (Bank#1)
My question is: Does this mean I need to change my O2 sensor?
And can anyone tell me what (bank#1) and (bank#2) means.
Thank you for your time...
Kimmie from Cali
</TD></TR></TBODY></TABLE>
I have a Ford F-150 4.2L 6cyl with 200,000 miles on it. I have 3 trouble codes which are,
1) System too lean (Bank#1)
2) System too lean (Bank#2)
3) Lack of upstream heated O2 sensor (HO2S11) switch,
Sensor indicates lean (Bank#1)
My question is: Does this mean I need to change my O2 sensor?
And can anyone tell me what (bank#1) and (bank#2) means.
Thank you for your time...
Kimmie from Cali
</TD></TR></TBODY></TABLE>
Senior User
Joined: Mar 2007
Posts: 307
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From: Livonia, MI
"Bank 1" means the side of the motor with plugs 1-3. "Bank 2" means the side of the motor with plugs 4-6. if you were looking at the motor fromt the front of the vehicle, Bank 1 should be the side on your left(passanger), and Bank 2 should be the side on your right(driver). and it does not nessicarily mean you need to change your 02 sensor. it may be going lean because of air entering the engine AFTER the mass air flow sensor(MAF). correct me if im wrong.
Last edited by 150mudder; Oct 30, 2007 at 06:40 PM.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Kim, you only have one fault causing the readout discription and you have 3 cylinders on each back.
Without futher info, there may be an air leak in the intake system at some point from the throttle body inward that the OX senors detect, causing the codes.
Without futher info, there may be an air leak in the intake system at some point from the throttle body inward that the OX senors detect, causing the codes.
Junior User
Joined: Oct 2007
Posts: 80
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From: Altus,AR
Kim
I have a '96 Bronco throwing the same code. I replaced both O2 sensors this weekend, and no change. I will let you know what I find out about mine as i have no vacuum leaks. You should follow the experts advice as I am new to trying fix a 'puter run vehicle. My '79 was much easier. Good luck.
I have a '96 Bronco throwing the same code. I replaced both O2 sensors this weekend, and no change. I will let you know what I find out about mine as i have no vacuum leaks. You should follow the experts advice as I am new to trying fix a 'puter run vehicle. My '79 was much easier. Good luck.
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