I had a check engine light cane on. I took it for it to get checked and they gave me this code- P0457 EVAP small leak detected. ECM has detected a large leak in the EVAP System during a system monitor test.
The paper said I had a leak in the Evap canister or hose. I took the truck to a mechanic and was told I had Bad oxygen sensors.
Can Bad/Dirty oxygen sensors make this error code come up?
Does anyone know exactly where the oxygen sensors are? I was told they were behind the mufflers but I didn't see any and the diagram I found was not accurate.

2002 Ford Ranger XLT v6 extra cab.

 

Good idea to have had the computer scanned & posting the trouble code Number.
Have a look here for an explanation of the P0457 code P0457 Evaporative Emission Control System Leak Detected EVAP Code
Lazy switching O2 sensors won't cause the 457 code, but if the O2 sensors have over 75K miles on them, their switching range & speed can slow with age & cause fuel trim problems & if that situation is present the computer will usually set codes for the faulty upstream O2 sensor/s, & any fuel trim problems they're causing. The upstream O2 sensors are located in the exhaust manifold down pipe, just ahead of the cat converters. There is an after cat converter O2 sensor that reports to the computer on how the cat converters are doing & it has its own set of codes. SO, if you have any more codes, post All code Numbers, as they can offer up good trouble shooting clues.
Bottom line, No, faulty O2 sensors won't cause the vapor recovery system 457 code.

 

Well hmilycar how is the trouble shoot going, curious minds would like to know.