1996 ford mustang

Question

Code p0420 and p0430. 4 new o.2 sensors.mil ELIMINATE...still codes come back....Do notice gaseous odor only from tailpipe..no physical gas leak

Answer 1

Hi there,

Try a couple of O2 sensor risers on each rear O2 sensor. It takes them out of the exhaust stream enough that the codes should stop coming up. If that doesn't solve it, then you will need a tuner and a tune to turn off the catalyst monitors.