anyone help me on diagnostic codes 01' dodge truck

[jackel440]

hey guys,My mom brought her truck down to my shop and said her engine light was on.So I cycled the key 3x's and I got a "p 0138" code.I looked up on allpar and it says that it's a "HO2S Cicuit High Voltage bank 1 sensor 2".I am not sure what exactly this is telling me.What would the refernce "bank 1" be?and then "sensor 2"?

[71superbee]

I'm pretty sure that it is referring to the oxygen sensor, and "sensor 2" would mean the downstream 02 sensor, the sensor after the converter

[mikepmcs]

Left side of the motor, second O2 sensor in the exhaust path.  In other words, there are 4 sensors, it will be the aft most sensor(towards the rear).

v/r
Mike

[jackel440]

driver side last O2 sensor in the exhaust correct?I will have to look when i get home from work.Thanks guys.I figure this must be from setting the last 2 months outside in the snow.I know it runs fine just showed up yesterday when we decided to unhook it from a horse trailer and take it to town.I take it I will probably just have to replace it?wonder how much that will cost me ???especially after i spent all my money at the swap meet last sunday

[mikepmcs]

If you have one of those cheapy diagnostic readers, go ahead and try to reset it.  If it's bad, it will come back on after approximately 3 warm up cycles.  Give it a shot it can't hurt if you haven't done it already.  Should be around $100 or so for an OEM O2 sensor(that was for an H2 anyway) Hopefully Dodge is more reasonable. Stay away from the aftermarket ones though(cheapy ones)  I've read a lot of negative about them.

v/r
Mike