P0420 bank 1 code

10

Asked by Aug 24, 2011 at 08:54 PM about the 1998 Lincoln Town Car Signature

Question type: Maintenance & Repair

my check engine light is on and it shows the P0420 code for bank 1. My car has 4 converters on it and the temp guage goes up when it sits for awhile idling. Was wondering if anyone thinks it is a bad Cat. Conv. and if there is a way to tell which one of the 4 are bad.  It also now has a cylinder #4 misfire.  Any help appreciated.

5 Answers

11,225

Bank One is Passenger Side - Blocked cat will cause overheating and misfires - #4 is also on The Passenger Side You usually replace the banks in pairs - So replace the Both On the passenger side and replace both O2's also to protect your INVESTMENT in Cat's

2 out of 2 people think this is helpful.
10

Thanks for the info, I appreciate it. Will I do any major damage driving it until I can get the money to fix it?

1 out of 1 people think this is helpful.
125

Your O2 sensors are fouled with carbon from the cylinder #4 misfire. Fix the misfire first then as suggested, replace both two O2 sensors on that side. Each sensor is about $50 dollars. A new cat is about 1,000 to 1,200 new. Start with the misfire and O2 sensors first. Unless your ignored the misfire for a long period of time. This would cause the cats to be fouled with excess carbon and lose their efficiency to do their job. Good Luck

2 out of 2 people think this is helpful.
15

Magnaflow cats in pairs for around $200-$250 for 96 tc

1 out of 1 people think this is helpful.

EASTERN CATALYTIC Part # 30383 ECO II Direct Fit and EASTERN CATALYTIC Part # 30384 ECO II Direct Fit at RockAuto for 148$ Canadian each! ;) (not legal for California or NY though)

Your Answer

Add photo

Related Questions

Town Car

Looking for a Used Town Car in your area?

CarGurus has 2,143 nationwide Town Car listings starting at $1,995.

ZIP:

Search Lincoln Town Car Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Lincoln Town Car Experts

#1 FordNut
FordNut
Reputation 1,640
#2 Tom Demyan
Tom Demyan
Reputation 1,400
#3 Tracy Hooks
Tracy Hooks
Reputation 1,390
View All

Related Models For Sale

Used Mercury Grand Marquis
25 Great Deals out of 2,144 listings starting at $1,985
Used Ford Crown Victoria
4 Great Deals out of 1,394 listings starting at $1,700
Used Lincoln Continental
3,791 listings starting at $42,995
Used Lincoln Navigator
122 Great Deals out of 5,977 listings starting at $1,995
Used Cadillac DeVille
5 Great Deals out of 1,953 listings starting at $1,600
Used Ford F-150
3,039 Great Deals out of 207,184 listings starting at $1,990
Used Toyota Camry
1,184 Great Deals out of 95,053 listings starting at $1,250
Used Mercedes-Benz S-Class
90 Great Deals out of 7,393 listings starting at $2,999
Used BMW 7 Series
156 Great Deals out of 5,622 listings starting at $3,299

Used Cars For Sale

2007 Lincoln Town Car Signature For Sale
72 listings starting at $2,450