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2008 sts 3.6 ck engine light codes $7ea/$7e8 catalyst system
2008 sts 3.6 ck engine light codes $7ea/$7e8 catalyst system effiiciency below threshold bank 1 … read more
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Im flushing my 1998 deville radiator system. I have 115k
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Cadillac DTS: hello, i have a question i was hoping maybe you
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Cadillac sts: i have a 2006 cadillac sts with a po420 catalyst
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2005 Caddy CTS OBDII code P0430 Catalyst efficiancy below threshold (bank 2). Any suggesti
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Jerry Newton
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Cadillac Deville: I have a 2002 Cadillac Deville North Star
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cadillac dts: 2006 dts caddy 4.6 engine light scanner says
2006 dts caddy 4.6 engine light scanner says po420 catalyst efficiency below threshold bank 1… read more
Canadafix
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2001 cadillac deville: engine light..obd2 code..p0420..below threshold
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2001 Cadillac El Dorado, ETC, V8 4.6 L, 279 C.I; 300 HP, VIN
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I get a code P0420 that is catalyst system low efficiency.
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I recently had to replace the engine in Cadillac Deville with 4.6l Northstar Engine. A remanufactured engine. The installer did not put in Dex-Cool but a coolant that is supposed to be either with Dex… read more
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2003 Cadillac Deville DTS: The Service Engine Soon light went
I have a 2003 Cadillac Deville DTS with app 100,000 miles. The Service Engine Soon light went on, the air conditioner stopped working. The dignostic at OnStar said several things: 1. Torque converter … read more
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deville: my 02..4.6 northstar) is showing a p0420 code..convertor.
my 02 deville (4.6 northstar) is showing a p0420 code. A mechanic told me to replace the cat. convertor. I did. It worked fine for a couple hundred miles then the engine light came on... same code??? … read more
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Meet the Experts:

Jerry Newton

Jerry Newton

Cadillac Technician

1,738 satisfied customers

ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

Dave Nova

Dave Nova

Cadillac Technician

1,522 satisfied customers

ASE Master Certification. GM World Class Certification

Gm Tech (Cam)

Gm Tech (Cam)

Cadillac Mechanic

1,090 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

John

John

ASE Certified Technician

941 satisfied customers

ASE CERTIFICATIONS A1-A8 & L1 / 40 YEARS AUTOMOTIVE EXPERIENCE

Chris (aka- Moose)

Chris (aka- Moose)

Cadillac Technician

54,632 satisfied customers

16 years of experience

George H.

George H.

ASE Certified Technician

783 satisfied customers

ASE Master Tech 15+ Years

Don - Mo Lurch

Don - Mo Lurch

Cadillac Technician

705 satisfied customers

GM, Cadillac Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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