what does code P0420 mean

Kymberly Miller
0

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

tenspeed
86,125

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.
Samuel Buck
125

probley be the front lamda sensor

3 out of 3 people think this is helpful.
Josh Funk
285

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

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

S40

Looking for a Used S40 in your area?

CarGurus has 1,347 nationwide S40 listings starting at $1,999.

ZIP:

Search Volvo S40 Questions

Volvo S40 Experts

#1 venom5150
venom5150
Reputation 620
#2 tenspeed
tenspeed
Reputation 270
#2 Tom Demyan
Tom Demyan
Reputation 270
View All

Related Models For Sale

Used Volvo S60"
130 Great Deals out of 6,163 listings starting at $1,900
Used Volvo S80"
49 Great Deals out of 1,343 listings starting at $1,499
Used Volkswagen Jetta"
453 Great Deals out of 32,489 listings starting at $999
Used BMW 3 Series"
1,190 Great Deals out of 38,310 listings starting at $1,000
Used Honda Civic"
884 Great Deals out of 52,316 listings starting at $995
Used Honda Accord"
1,044 Great Deals out of 72,832 listings starting at $1,400
Used Volvo C70"
38 Great Deals out of 602 listings starting at $1,695
Used Audi A4"
271 Great Deals out of 12,074 listings starting at $1,299
Used Volkswagen Passat"
220 Great Deals out of 20,497 listings starting at $1,500
Used Toyota Corolla"
1,131 Great Deals out of 65,621 listings starting at $1,295
Used Ford Mustang"
675 Great Deals out of 41,120 listings starting at $1,500

Used Cars For Sale

2011 Volvo S40 For Sale
4 Great Deals out of 47 listings starting at $6,999
2010 Volvo S40 For Sale
62 listings starting at $3,495
2009 Volvo S40 For Sale
5 Great Deals out of 88 listings starting at $5,700
2008 Volvo S40 For Sale
4 Great Deals out of 146 listings starting at $3,500
2007 Volvo S40 For Sale
3 Great Deals out of 205 listings starting at $3,800