P0420 bank 1 code

bjtrans26
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

Mike Bonnell
10,235

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.
bjtrans26
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.
al4758
115

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.
djbacker1
15

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

1 out of 1 people think this is helpful.
droidcrasher
0

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 2,079 nationwide Town Car listings starting at $1,800.

ZIP:

Search Lincoln Town Car Questions

Lincoln Town Car Experts

#1 FordNut
FordNut
Reputation 1,230
#2 Tracy Hooks
Tracy Hooks
Reputation 1,080
#3 Tom Demyan
Tom Demyan
Reputation 1,060
View All

Related Models For Sale

Used Mercury Grand Marquis"
43 Great Deals out of 2,323 listings starting at $1,599
Used Ford Crown Victoria"
4 Great Deals out of 1,356 listings starting at $3,000
Used Lincoln Continental"
371 listings starting at $1,950
Used Cadillac DeVille"
7 Great Deals out of 2,097 listings starting at $1,995
Used Lincoln Navigator"
139 Great Deals out of 6,113 listings starting at $2,999
Used Ford F-150"
2,510 Great Deals out of 209,610 listings starting at $1,350
Used Ford Mustang"
427 Great Deals out of 43,320 listings starting at $1,800
Used Chevrolet Tahoe"
869 Great Deals out of 30,252 listings starting at $2,445
Used Chevrolet Suburban"
576 Great Deals out of 21,036 listings starting at $1,995

Used Cars For Sale

2007 Lincoln Town Car Signature For Sale
73 listings starting at $6,899