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
49,935

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
185

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

Your Answer

Related Questions

  • 2000 S40 Check engine light 3 answers

    I recently replaced the oxygen sensors in my s40 but, the check engine light is still on. I took it to Autozone to have them reset the light, but they said that was illegal and refused to do it. The...

    2000 Volvo S40 STD

    -

    Maintenance & Repair

  • Yesterday I tried several times to start my 2001 S40 Volvo. It says "in service" and "check engine" 1 answer

    From yesterday, each time I start my car. the "in service" and "check engine" lights are on. What should I do to deal with this problem? Is it safe for me to drive on free way to have my car checked b...

    2001 Volvo S40 STD

    -

    Maintenance & Repair

  • whats engine service for volvo s40? 1 answer

    2007 Volvo S40 2.4i

    -

    Maintenance & Repair

  • Timing Belt or New Car? That is the Question. 7 answers

    I have a 2001 s40 with 71,000. It will cost $2800 to repair. I'd prefer to fix it, but not if it's going to open a whole new can of worms. Any advice is greatly appreciated.

    2001 Volvo S40

    -

    Maintenance & Repair

  • Volvo s60 codes

    What do the following three codes mean ECM 2041 ECM 2020 2-3-1

    2004 Volvo S60 2.5T AWD

    -

    Maintenance & Repair

S40
Looking for a Used S40 in your area?
CarGurus has 1,292 nationwide S40 listings starting at $1,995.
ZIP:

Search Volvo S40 Questions

Volvo S40 Experts

#1 tenspeed
tenspeed
Reputation 210
#2 venom5150
venom5150
Reputation 180
#3 ksnow
ksnow
Reputation 130
View All

Related Models For Sale

Used Volvo S60"
155 Great Deals out of 7,873 listings starting at $1,418
Used Volkswagen Jetta"
827 Great Deals out of 45,865 listings starting at $995
Used Volvo S80"
59 Great Deals out of 1,786 listings starting at $1,995
Used Honda Accord"
1,121 Great Deals out of 81,451 listings starting at $1,000
Used BMW 3 Series"
1,146 Great Deals out of 34,977 listings starting at $1,800
Used Audi A4"
285 Great Deals out of 10,204 listings starting at $1,450
Used Volvo C70"
36 Great Deals out of 809 listings starting at $2,345
Used Honda Civic"
740 Great Deals out of 49,030 listings starting at $999
Used Volvo S70"
225 listings starting at $1,500
Used Volkswagen Passat"
389 Great Deals out of 27,100 listings starting at $1,000
Used Volvo V70"
23 Great Deals out of 708 listings starting at $2,200

Used Cars For Sale

2011 Volvo S40 For Sale
4 Great Deals out of 80 listings starting at $12,000
2010 Volvo S40 For Sale
6 Great Deals out of 79 listings starting at $9,995
2009 Volvo S40 For Sale
68 listings starting at $8,995
2008 Volvo S40 For Sale
12 Great Deals out of 116 listings starting at $6,499
2007 Volvo S40 For Sale
7 Great Deals out of 186 listings starting at $5,495