what does code P0420 mean

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

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

92,215

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.

6 out of 6 people think this is helpful.
135

probley be the front lamda sensor

3 out of 3 people think this is helpful.
305

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

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

S40

Looking for a Used S40 in your area?

CarGurus has 1,249 nationwide S40 listings starting at $1,700.

ZIP:

Search Volvo S40 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Volvo S40 Experts

#1 venom5150
venom5150
Reputation 690
#2 Tom Demyan
Tom Demyan
Reputation 320
#3 tenspeed
tenspeed
Reputation 280
View All

Related Models For Sale

Used Volvo S60
136 Great Deals out of 8,033 listings starting at $1,988
Used Volvo S80
39 Great Deals out of 1,097 listings starting at $1,750
Used BMW 3 Series
1,522 Great Deals out of 38,936 listings starting at $1,495
Used Honda Accord
982 Great Deals out of 75,080 listings starting at $899
Used Volkswagen Jetta
506 Great Deals out of 31,578 listings starting at $1,000
Used Audi A4
338 Great Deals out of 12,174 listings starting at $950
Used Honda Civic
860 Great Deals out of 70,031 listings starting at $1,200
Used Toyota Camry
1,206 Great Deals out of 96,014 listings starting at $1,250
Used Toyota Corolla
976 Great Deals out of 67,452 listings starting at $1,595
Used Mercedes-Benz C-Class
684 Great Deals out of 32,002 listings starting at $2,500

Used Cars For Sale

2011 Volvo S40 For Sale
50 listings starting at $5,997
2010 Volvo S40 For Sale
3 Great Deals out of 60 listings starting at $4,500
2009 Volvo S40 For Sale
89 listings starting at $4,995
2008 Volvo S40 For Sale
4 Great Deals out of 156 listings starting at $2,800
2007 Volvo S40 For Sale
5 Great Deals out of 215 listings starting at $2,900