Back to PO430 98 suburban 5.7L 2WD HELP

[shultzee13]

Replaced both Cats less than 3 months aLucky
All 4 O2 sensors replaced 2 weeks ago.
Last night changed the oil pressure sending unit on back of the motor.

Was very careful not to bump anything and now I am getting a code PO420 Bank 1 and the camshaft position code 340
Clear codes and reran several times, now only PO430. What in the world???

All I did was change the stinking oil pressure sending unit. The distributor is tight, It doesn't move an inch.

I do have a pretty massive oil leak going on from somewhere seeing as I still see oil on the white oil filter.
I was told on here it was either the oil pressure sending unit or the filter body leaking so that's why I changed 1 of the two hoping that was it.
Now I still have the oil leak and code(2) to boot. Lucky Me.


THIS IS INSANE
HELP

[speedygonzales]

Check the right rear O2 for oil contamination. I lost an O2 from an oil leak once.

Incidentally the rear O2s are only there to check on the status of the cat convertors. If you are tired of the problems associated with them you can either have them programmed out like I did or you can get O2 simulators and be done with them for good for around $40.

[speedygonzales]

Incidentally, if you have a smart phone and $35 you can check the signal from all the O2s. That's how I found my bad one.

[61_FL_Apache]

I've had a SEL off and on for years for that.. I clear the code and move on.