PonyGirl 63

I keep getting these codes, they started after I have the transmission service. It runs great except when idling for a long period of time gets a little rough but when I start moving run great and gets great gas mileage.
Thanks

Str8pipe03GT

P1131: Lack of HO2S-11 Switch, Sensor Indicates Lean

P1151: Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2

Neither of these have anything to do with your transmission that was serviced. Your catalytic converters might have gone bad and the front and rear O2 sensors tapped into the mid pipe are recognizing this. Probably illuminating the MIL or "check engine soon" light.

SpartaPerformance

Before you drop hundreds on o2's why not go through proper diagnostics first.

• Check air intake system for leaks, obstructions or damage
• Inspect entire length of vacuum hoses for:
• proper connections
• damage or cracks
• damaged or cracked vacuum tees
• Verify the integrity of the entire PCV system
• Verify proper PCV part number is installed

If none of these are present there are a few other diagnostic procedures that should be followed.