Its your oxygen sensors and catalytic converter
Cost and complexity depends on exactly what trouble codes you found. Post the codes and we can help. Saying that it's the pollution control system is way too broad. There are many components in the system
SOURCE: MAP sensor 1994 Cadillac Deville
The map sensor shouldn't cost more than 50 bucks or so. It is very easy to change, and can be done w/ simple tools. It mounts to the intake manifold. There is a wire connector that plugs into it. Just remove the two mounting bolts, and the connector, and it will pop right off. This is not a tough repair, so it can be done in about 10 minutes at most. This should save a trip to the repair shop!
SOURCE: 2003 Cadillac Deville a check gas cap error appears with svc engi
put a new gas cap, those system are pres. even if
the cap look ok it maby leaking replace with a new
one it should solve your prob.
eng.ligh come on because of the gas cap
SOURCE: Check engine light on, 1997 cadillac Deville.PCM codes
PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.
SOURCE: Cost of battery for 2002 Cadillac Deville
USE ONLY A DELCO BATTERY, THEY ARE THE BEST, WITH INSTALL AND BATTERY ABOUT $150
SOURCE: How to reset the "Check Engine Light" on my 2003 Cadillac STS
Your car is equipped with an OBD II system and requires and OBD II scan tool to reset the check engine light. There is a port under the dash that it hooks to.
A very basic tool is available from a variety of places for about $20.(i.e ebay, Harbor Freight)
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tO ATTEMPT TO ANSWER THIS QUESTION YOU WILL HAVE TO FIND OUT WHAT CODES ARE IN THE COMPUTER
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