97 Cadillac Deville (Service Engine

userpete1037 · #1 12-01-2011, 07:01 PM

My car is idling rough and the Service Engine light blinks on/off continuously. I ran the codes and they are P0301, P0401 and P1258. Does anybody know what this could be? I changed the plugs, wires and ignition coils about a year ago. Catalytic converter was replaced around the same time but the O2 sensors hasn't been changed. Could that be the cause?

maxwedge · #2 12-02-2011, 08:04 AM

301 is a percieved engine miss in #1 cyl. Google the other two for in depth info, plenty of info out there.

Thread Thread Starter Forum Replies Last Post

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Engine Coolant and Heater on a 1990 Cadillac DeVille?	butturinij@uwplatt	Deville	2	11-03-2009 09:04 PM
2003 deville service engine light	BIGDADDY0034	Deville	1	10-05-2008 07:50 PM
96 Cadillac Deville-Service Ride Control HELP	SarahGuess	Deville	2	10-16-2007 09:01 PM
'97 deville service engine soon	nava33	Deville	2	05-24-2006 10:07 PM
NORTHSTAR ENGINE PROBLEMS - CADILLAC DeVILLE 1994 AND NEWER – CALIFORNIA	waltonlaw	Deville	0	12-23-2004 07:24 PM

POST REPLY TO THIS THREAD