the odb scanner said bank 1 sensor code P0135 where would i find this sensor 01 dodge dakota 4.7 quad cab

 

It depends on whether or not you have federal or California emissions. Federal has 2 O2 sensors, CA has 4 (surprise).

Federal - you'll find it on the passenger side, outboard of the transmission.
CA - it'll be on the drivers side, just under the exhaust manifold, ahead of the pre-cat.

 

ok so that is whats throwing p0135 sensor heater circuit malfunction (cylinder bank no.1,sensor no.1) code and thanks so very much for your help