V8 - Bank 1 = cylinders 1-4 (Passenger side)
Action taken:
1) Ramp/Jack-up Frnt of car.
2) On the passenger side crawl under car and pull both oxygen sensors out.
There's a pre + post sensor for the catalytic converter,and don't mix them up.
3) Tap on catalytic conveter - is it solid,or sound like a tin can?
4) Put a pieace of wire through oxygen sensor hole on the pre side.
5) If wire go's threw with no resistance,the brick is blown-out.
A bad oxygen sensor or bad cat can cause a low catalyst efficiency problem.
Are you still having a problem with EGR system?
Theres a Temp sensor for EGR system to tell how hot the car is.
The ECM will give the control signal to the EGR at the right time to Open/Close.
Theres also a feedback sensor that checks the EGR system.
Sometime the ports get block with EGR/PCV sluge. ''insufficient flow''
CAUTION -
If this car was running for awhile with bad EGR system,it could cause the
catalytic converter to go bad.
Aso a Hole in the Road or Speed bump can break down a CAT down too!
The suspenshion is very firm on Luxury Sport Sadans.
MCGIVER