2004 dakota with code P0157

Oxygen sensor input voltage maintained below normal operating range. Possible bad sensor..connection or contamination

Sensor 2 Bank 2 is the left rear oxygen sensor. It problably is bad and needs to be replaced before your next inspection. The rear oxygen sensor just monitors what is coming out and isn?t as important as the front oxygen sensor. The car will still run properly if you don?t replace it but will not pass inspection, in most states, if you don?t replace it. The part is inexpensive (about $30) but is hard to replace without the proper tool. They make a special socket for replacing oxygen sensors. You should be able to pick up the socket for $15-$20. It has an opening for the attached wire. You could try to remove the old one with an open ended wrench but you will probably strip it. It?s a 22 mm or 7/8 inch.

"Jerry" wrote: > Code P0157 shows up. Know it stands for HO2S Circuit Low > Voltage Bank 2 > Sensor 2 . Anybody know what that means?

You don't need the tool, cut the wire off the old sensor which will now allow a box 7/8 wrench to remove it. when installing it, just use the open end 7/8 wrench.

Glenn Beasley Chrysler Tech

Wouldn't hurt to soak the hell out of it with some Liquid Wrench, WD-40, PB, or some other penetrating oil either. Those suckers can be tough to get out and any help you can get would be good.