The check engine light came up on my 98gt and it threw two codes- p1131 and p1260, where would i go to find out what these mean.

 

Autozone.

 

http://www.obd-codes.com/trouble_codes/ford/

 

ok thanks alot

 

I clear the codes, and a few days later the same code came up again(Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1) but from another o2 sensor. The car seems to run fine does this mean i need new o2 sensors, or a whole new tune since it says im running lean?

 

well. if u wanna check if u are really running lean then you should put it on a dyno and check the A/F ratio. do you have an aftermarket midpipe? if u do that could be causeing the SES light

 

Whats done to the car?

 

I bought the car used with a catback and I think it has hi flow mid pipes because it only has 2 converters. Other then that I did a pi swap and have a 160 thermostat. I've been driving the car since the begining of september with the swap.

 

Full PI swap? Get it tuned.

 

i got a tune from mustang tuning when i bought the sct

 

when i ordered the tune i had included everthing done to the car even the pi swap. Do you think its still the tune and i should have it dyno tested?

 

still get it dyno tuned! even if they tuned for the heads its only enough to hold off a dyno tune for a short time. Nothing beats a dyno tune cuz then you can get the A/Fs at the perfect numbers(unlike mail orders which can have the car run lean or rich). oh the other plus for the dyno tune is you can see your numbers then.

 

sounds good ill go with that then thanks