Lean O2????????

[CARdiac]

Sorry this post should have gone here first.

I have gotten a couple of Left O2 Sensor lean codes?

What does this mean? My MPG has gone to sh*t and I have a rough idle.......Is my O2 sensor going or am I really running lean....the SES code is infrequent, but the number on my scanner when I monitor the left sensor are much lower than the right.......

Any help is appreciated.

[Backfire]

If the PCM thinks a bank is running lean due to a bad O2, wouldn't it attempt to add more fuel, making you run rich and killing gas mileage?

[AMinor65]

Try running a couple of bottles of fuel injector cleaner through your system. Looking at your mods, I see no reason for you to go lean unless your'e not getting enough fuel from the injectors or the fuel pump. I guess that you can check your fuel pressure also.

[Magnus]

moving to general tech.

This seems pretty basic problem diagnostic, mpg loss.

I'm cracking down on non-advanced topics in advanced tech.. Seems as if it's gotten a little more lax in that section.

[ April 28, 2003: Message edited by: Magnus ]</p>