what does code P0420 mean

Kymberly Miller
0

Asked by Kymberly Feb 05, 2013 at 01:37 PM about the 2001 Volvo S40 STD

Question type: Maintenance & Repair

my check engine light came on and  i had it scanned and the code was P0420.. what does that code mean?

3 Answers

tenspeed
57,085

P0420 - Catalyst System Efficiency Below Threshold Bank 1 -- As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

2 out of 2 people think this is helpful.
Samuel Buck
75

probley be the front lamda sensor

2 out of 2 people think this is helpful.
Josh Funk
205

tenspeed is right...sounds like a bad 02 sensor...affects emissions.

Your Answer

Add photo

Related Questions

S40
Looking for a Used S40 in your area?
CarGurus has 1,316 nationwide S40 listings starting at $2,362.
ZIP:

Search Volvo S40 Questions

Volvo S40 Experts

#1 venom5150
venom5150
Reputation 230
#2 tenspeed
tenspeed
Reputation 210
#3 ksnow
ksnow
Reputation 140
View All

Related Models For Sale

Used Volvo S60"
155 Great Deals out of 9,210 listings starting at $995
Used Volvo S80"
47 Great Deals out of 1,650 listings starting at $999
Used BMW 3 Series"
1,445 Great Deals out of 37,311 listings starting at $895
Used Volkswagen Jetta"
948 Great Deals out of 37,535 listings starting at $1,350
Used Honda Accord"
1,136 Great Deals out of 67,494 listings starting at $950
Used Volvo C70"
46 Great Deals out of 756 listings starting at $2,995
Used Audi A4"
332 Great Deals out of 11,226 listings starting at $1,795
Used Volkswagen Passat"
557 Great Deals out of 27,007 listings starting at $1,495
Used Acura TL"
332 Great Deals out of 6,686 listings starting at $2,200
Used Honda Civic"
937 Great Deals out of 62,957 listings starting at $899
Used Saab 9-3"
65 Great Deals out of 1,479 listings starting at $1,600

Used Cars For Sale

2011 Volvo S40 For Sale
4 Great Deals out of 77 listings starting at $10,495
2010 Volvo S40 For Sale
3 Great Deals out of 83 listings starting at $7,600
2009 Volvo S40 For Sale
83 listings starting at $7,450
2008 Volvo S40 For Sale
11 Great Deals out of 115 listings starting at $4,990
2007 Volvo S40 For Sale
11 Great Deals out of 182 listings starting at $4,991