code 0420

Manifolds, flexpipe, catalytic converters, mufflers, hangers, piping, EGR etc.
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Topic author
rooster4
I am merely driving my van
I am merely driving my van
Posts: 12
Joined: Wed Jun 13, 2007 5:54 pm

code 0420

Post by rooster4 »

Hi My 98 astro shows a code of 0420 at auto zone. He says its the cat. I had this replaced about 4 years and 20,000 miles ago. could it be bad already.?
1998 astro
2006 cobalt
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LiftedAWDAstro
I have my van tatooed on my cheeks
Posts: 4379
Joined: Sat Sep 09, 2006 3:35 pm
Location: New Haven, NY

Re: code 0420

Post by LiftedAWDAstro »

It could be but when was the last tune-up done and how many miles on the van?
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition

Mileage spreadsheet

Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
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