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
53,365

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
195

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 1,361 nationwide S40 listings starting at $1,599.
ZIP:

Search Volvo S40 Questions

Volvo S40 Experts

#1 venom5150
venom5150
Reputation 220
#2 tenspeed
tenspeed
Reputation 210
#3 ksnow
ksnow
Reputation 130
View All

Related Models For Sale

Used Volvo S60"
110 Great Deals out of 8,349 listings starting at $1,995
Used BMW 3 Series"
1,223 Great Deals out of 37,756 listings starting at $1,200
Used Volvo S80"
55 Great Deals out of 1,786 listings starting at $999
Used Volkswagen Jetta"
1,077 Great Deals out of 37,069 listings starting at $1,995
Used Audi A4"
310 Great Deals out of 10,400 listings starting at $1,800
Used Volkswagen Passat"
489 Great Deals out of 26,692 listings starting at $1,495
Used Volvo C70"
42 Great Deals out of 704 listings starting at $2,495
Used Honda Accord"
1,251 Great Deals out of 66,123 listings starting at $1,000
Used Mercedes-Benz C-Class"
671 Great Deals out of 20,954 listings starting at $2,850
Used Toyota Camry"
1,586 Great Deals out of 70,498 listings starting at $1,395

Used Cars For Sale

2011 Volvo S40 For Sale
77 listings starting at $11,495
2010 Volvo S40 For Sale
7 Great Deals out of 82 listings starting at $9,450
2009 Volvo S40 For Sale
5 Great Deals out of 101 listings starting at $7,490
2008 Volvo S40 For Sale
5 Great Deals out of 109 listings starting at $5,497
2007 Volvo S40 For Sale
9 Great Deals out of 181 listings starting at $3,995