We have a 97 Camaro with the 3.8L V6. The two engine check engine codes are 0420 and 1406. Is it possible that the EGR valve problem is causing the catalytic converter problem? thanks

I went google and typed in-- location of egr valve on ford 3L v6 engine 2006--- and got pages showing exactly where it is
the model that the engine is doesn't really matter as it is the assembled engine that has the egr valve, so 3L v6 engine will have one regardless if it is a ranger , taurus or what ever.
part number is 18734-05059775 and has a listed price of $52.33
( parts geek.com)
another point is that with every code there are several causes for a code number
I might suggest an accredited service center with experience on your make of vehicle might be a better place to go

My experience has been with later model vehicles, but a bad throttle position sensor most definetly causes this type of situation. Two torx screws, opposite side if the throttle body, should have a three wire plug.

First of all, why was the O2 snsr replaced?... Check Engine light? What DTC (diagnostic trouble code) did you find stored in the ECU (Engine Control Unit)? The drivability you seem to be describing can have multiple causes -- faulty sensors, malfunctioning computer, clogged catalytic converter, leaky injectors, vacuum leaks, etc.

Ok... this is gonna take some time. The 04 Santa Fe came with 3 (three) different/possible engines -- the 4 Cylinder 2.4 lit, the 2.7 V6, and the 3.5 V6. Only the 2.4 (4 cyl) and the 3.5 V6 are equipped with EGR. The 2.7 does NOT have EGR. To answer part of your question, the EGR system on the 4 Cyl is known to develop restriction(s) in the EGR port (from the # 4 cylinder exhaust port to the EGR valve at the intake manifold). This port travels through the head (front to rear, i.e., Left to Right when viewing the engine from the transmission end). This port cannot be seen at the # 4 cylinder exhaust port unless you remove the exhaust manifold.

It would be very helpful if you could provide more detailed/specific information regarding the drivability issue & what/which codes were found related to the Check Engine light.

Possibly ignition wires. Is the engine light on? If yes, have the car scanned for trouble codes and report codes to FixYa.

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

ALL TUNEUP Parts Must be Fresh or refreshed to Be Sure THEY are Not the Problem ALSO FUEL FILTER

you prob need a coolant temp sensor

I know you are saying it is an egr code being set but I believe it is very possible map sensor can cause this sort of issue or if it is possible can you disconnect the exhaust long enough to run it for a 5 minutes? Catylitic converter beginning to have issues. just a couple tips.

egr code can mean egr valve or egr controller you might also have carbon buildup in the engine causing the code

you can take it to autozone the will test it for free to see if it something else