It could be the sensor, its wiring or the engine computer tht is causing the problem. You had wasted a lot of time and money on something that did not solve the problem. Were the wirings checked for shorting or open circuit?
Was the replaced O2 sensor OEM?
This trouble code would make the ECM go into fail-safe mode meaning the fuel would not be metered according to operating conditions but on a fixed programmed delivery and this would result in increased fuel consumption.
Saturday, November 3rd, 2012 AT 1:17 PM