cel came on not sure what all to check its for o2 sensor bank 1 sensor 1.

 

Are you sure that you have the correct code number? What year, make, model?

Diagnostic Trouble Codes P1100 and above are manufacturer specific, meaning that a code number may have a completely different definition between a Kia and a Ford, for example. My info says that Ford DTC P1295 is for an injector fault on Bank 1 (passenger side) FOR DIESEL ONLY.

 

sorry it is p2195 o2 sensor signal biased/ stuck lean bank 1 sensor 1. on a 2003 4.0 soch

 

Bank 1, sensor 1 is the oxygen sensor closest to the engine on the passenger side.

The troubleshooting guide has a long laundry list of possibles but many are not common. I'd look for anything simple that could cause a lean condition at the sensor with emphasis on the passenger side:

• port vacuum leak
• dirty injector(s)
• exhaust leak upstream of Oxygen Sensor 1-1
• defective or contaminated Oxygen Sensor 1-1

There are a few other possibilities but these will often (not always) trigger codes for sensors in both banks:

• manifold vacuum leak
• unmetered air leak
• PCV leak
• evap system leak
• dirty MAF element
• low fuel pressure