So a couple of days ago the check light when on my 2005 ford mustang gt with the codes p0330 p0325 p0155 p0135. So i took it to a ford dealer to get it diagnose and after a week and a half the dealership couldnt find the problem so i was wondering if you guys have any advice. They tested all my sensors and they said they were all fine. The car is mostly stock just a c&l air intake, LT headers, o/r x pipe with a bama tune. Car runs fine no lagg at all just that dam light. Any advice would be appreciated thanks

 

Those codes are for both O2 sensor heater circuits and both knock sensors. I suspect that the BAMA tune hasn't allowed for the longer time that the O2 sensors need to warm up now that they're further away from the engine. As a result the engine doesn't stay in open loop long enough after a cold start, resulting in a lean A/F mixture during the short transitional period between the ECU commanding the engine to go into closed loop and the O2 sensors reaching correct operating temp.
A revision in the tune should solve it.
Your Ford stealership seems to be about as useful as **** on a bull.

 

How are you able to run that exhaust setup in Cali (LT Headers and an off-road X pipe)?

 

In Tennessee we would call your dealer, 'a bunch of dumb asses'.

 

It also sounds like ignored the codes due to the modified exhaust. I can see a Cali dealer doing that. You can test the individual sensors to see if they are working within spec, which is what they did. But, that doesn't tell you if the operational range for the various mods is correct.

OP, how long after your mods did the light kick on? Days, weeks, months? The tuner may need to compensate for the sensors.