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check the 5v reference voltage at cam crank and map snr s and compare if all values are low u have to check strait out of the pcm if low there u have a bad pcm
OBD II P0157 due to Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 2)
This code refers to a fault in the post-catalyst o2 sensor on Bank 2. First, a basic run-down of the catalyst: The Catalytic Converter is used to help control tailpipe emissions, to "clean up" the exhaust, if you will. The PCM (Powertrain Control Module) uses the signal from the heated oxygen sensor to the rear of the catalyst to monitor the catalyst's efficiency by comparing it to the o2 sensors in front of the catalyst.
The alternator may be charging at 14v but if the battery cannot hold charge, then a low voltage issue may be present. If a jumpt start worked to get the vehicle going, then I'm assuming your battery is close to dead.
The meaning if this code is voltage low for the Oxigen sensor bank #2 sensor #2. Here's more info of the web on this subject. http://www.obd-codes.com/p0157
If it turned over slowly, You most likely need a battery. The light can/will come on for battery voltage low. You should have it checked to make sure though.
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