fault codes

[Jordan]

I've pulled up two fault codes that I can't seem to find info on. Does anyone know what fault codes P7400 and Pef00 are, any help would be appreciated.

 

[discomike]

Jordan,
What year and model truck do you have? How many miles and what is it doing?
I can't find any code numbers anything close to what you have listed, how did you get them and from where?
Mike J.

 

[Jordan]

I've got a 99 Discovery series2, 85K. I pulled 3 codes off the obd using a laptop (autoenginuity program). The codes that came up were, p171,p7400, and pef00. The p171 is bank 1 running too lean (o2sensor), but the program doesn't recognize the other 2 codes, it says there manufacturer specific. I'm thinking they might be in a service manual. I don't want to replace the o2 sensor until I know what the other codes are. Thanks for any help!!!

 

[discomike]

Jordon,
A 171 code is a bank to leab and has no reference to an O2 sensor. How many miles are on your truck? What is your truck doing wrong?
Mike J.