9stanger8

i have a question. my car is running real lean on the left side to the point where it doesnt have any power. i have changed the coil packs spark plugs maf sensor and throttle position sensor and added mil eliminators. does anyone have any idea what this could be. its a 1998 mustang with a 2003 motor long tube headers high flow cats and x pipe. would gladly appreciate the help [/align]

oxfordgt

what injectors do you have?

9stanger8

as far as i know there stock.
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1

9stanger8

thats the code it is displaying. but i changed the plugs yesterday and all and one side is brown and the other side where black.

mustangman03

change your o2 sensor

9stanger8

would that make my car run bad. everyone else i have asked said it wont make it run bad it would just make me get bad gas mileage. i just dont wanna keep spending money for stuff that doesnt work lol. if i do ill have a new car by then

oxfordgt

yeah change out the o2's

9stanger8

ok. guess i will try that then. so should i ghange both of the front ones or just the left one thats reading bad