2007 Jeep Wrangler trouble codes P0300, P0132

DSP

MEMBER
2007 JEEP WRANGLER
6 CYL
4WD
AUTOMATIC
46,455 MILES

I have had a crack in the exhaust mfld for some time. I thought I fixed it but did not replace the gasket, put on new gasket. I am now getting trouble codes p0300, mult cylinder misfire, and p0132. O2 sensor circuit high. Did I damage my spark plug wires removing them, or is my 02 sensor toast from not fixing the exhaust mfld leak? I am out of warranty

Thanks for the help
Dave P
Redford, MI

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

P0300 Random misfires normally caused by vacuum leaks and bas fuel.

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

A code P0132 may mean that one or more of the following has happened:

The oxygen sensor heater circuit is shorted out
The wiring to the sensor is broken / frayed (less likely)
Possible SolutionsThe simplest thing to do is to reset the code and see if it comes back.

If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:

Check for wiring problems (shorted, frayed wires)
Check the voltage of the oxygen sensor