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
59,105

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.

3 out of 3 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
215

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

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

S40
Looking for a Used S40 in your area?
CarGurus has 1,357 nationwide S40 listings starting at $2,290.
ZIP:

Search Volvo S40 Questions

Volvo S40 Experts

#1 venom5150
venom5150
Reputation 270
#2 tenspeed
tenspeed
Reputation 220
#3 ksnow
ksnow
Reputation 140
View All

Related Models For Sale

Used Toyota Camry"
931 Great Deals out of 78,853 listings starting at $1,500

Used Cars For Sale

2011 Volvo S40 For Sale
7 Great Deals out of 77 listings starting at $9,195
2010 Volvo S40 For Sale
3 Great Deals out of 78 listings starting at $8,995
2009 Volvo S40 For Sale
6 Great Deals out of 80 listings starting at $7,250
2008 Volvo S40 For Sale
6 Great Deals out of 107 listings starting at $5,995
2007 Volvo S40 For Sale
11 Great Deals out of 187 listings starting at $4,300