ok about to go to the creek for topless and this shows up this weekend. where is it and how hard is it to change.

 

Here is some information for the code you have. O2 sensor 2/2 if the lower one on the driver's left side of the engine.

P0157-O2 SENSOR 2/2 CIRCUIT LOW

• When Monitored: With the engine running, battery voltage greater than 10.4 volts, and no O2 sensor heater DTCs present.
• Set Condition: The PCM detects that the 2/2 Oxygen Sensor signal voltage is below approximately 1.5 volts for 2.8 seconds after engine startup. The DTC will set as Pending after one trip and Active after two trips. Three good trips to turn off the MIL.

[TABLE]
[TR]
[TD="bgcolor: white"]Possible Causes
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO GROUND
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]O2 2/2 SIGNAL CIRCUIT SHORTED TO GROUND
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]O2 SIGNAL CIRCUIT SHORTED TO THE O2 RETURN DOWNSTREAM CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]O2 SIGNAL CIRCUIT SHORTED TO THE O2 2/2 HEATER GROUND CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]2/2 O2 SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]POWERTRAIN CONTROL MODULE (PCM)
[/TD]
[/TR]
[/TABLE]

 

just switched from wine to beer right now. what can i do

 

Just replace the driver side o2 sensor the one below the catalytic converter