catalyst system efficiency below threshold bank 1 VW Passat


Asked by Aug 19, 2015 at 10:23 AM about the 2005 Volkswagen Passat GLS 4Motion

Question type: Maintenance & Repair

My question is that my engine light would always come on and stay on stating Catalyst system efficiency below threshold bank 1. I was told by the VW dealership i need a new catalytic converter. I put it on now the check engine light randomly will come on and off instead of it always being on before for the same error code. Any ideas would be great thanks. 2005 VW Passat GLS 4 Motion 1.8T 160,000KM (100,000MILES)

1 Answer


Try Mr. Gasket 120007 converter cleaner, sometimes it works sometimes it don't, just depends on what is contaminating the converter.

Your Answer

Add photo

Related Questions

  • 2000 VW Passat rpm drops cuts off when stops 1 answer

    Please help! have a 2000 VW Passat about 110k miles on it and my check engine light is on. I had it ran and the codes that popped up were P0441 Evap control system incorrect purge flow P0134 H02S (...

    2000 Volkswagen Passat GLS V6


    Maintenance & Repair

  • 1992 VW Passat won't start 16 answers

    My son's 1992 VW Passat died about 200 feet from our house. There were no problems before it died. Now it turns over but won't start. The mechanic thinks it's a bad fuel distributor, but isn't sure....

    1992 Volkswagen Passat 4 Dr GL Sedan


    Maintenance & Repair

  • sorry , it is a 1995 vw. passat 1 answer

    i need to know where the car alarm is for a 1995 vw passat , because it goes off even when the car is going i need to unplug it . thanks ...

    1995 Volkswagen Passat


    Maintenance & Repair

  • Vw passat won't start 15 answers

    I have a 2006 vw passat 2.0 100 k miles. It won't start I've put a new fuel pump on battery and new alternator and still no look on starting. I have had an auto elec to see if it's and wires they se...

    2006 Volkswagen Passat


    Maintenance & Repair

  • how to mute my stereo in my 2014 VW Passat 3 answers

    how to mute my stereo in my 2014 VW Passat

    Volkswagen Passat



Search Volkswagen Passat Questions

Volkswagen Passat Experts

#1 Tom Demyan
Tom Demyan
Reputation 1,030
#2 tenspeed
Reputation 900
#3 littlehorn
Reputation 890
View All

Related Models For Sale

Used Volkswagen Jetta"
630 Great Deals out of 32,411 listings starting at $1,200
Used Honda Accord"
1,267 Great Deals out of 77,937 listings starting at $1,395
Used Toyota Camry"
1,586 Great Deals out of 98,337 listings starting at $895
Used Audi A4"
335 Great Deals out of 12,944 listings starting at $1,500
Used BMW 3 Series"
1,624 Great Deals out of 39,575 listings starting at $888
Used Nissan Altima"
1,405 Great Deals out of 87,812 listings starting at $1,195
Used Honda Civic"
1,120 Great Deals out of 58,276 listings starting at $1,300
Used Ford Fusion"
1,420 Great Deals out of 79,217 listings starting at $1,450
Used Volkswagen Golf"
35 Great Deals out of 2,668 listings starting at $2,250
Used Volkswagen Touareg"
45 Great Deals out of 2,469 listings starting at $3,799
Used Volkswagen GTI"
109 Great Deals out of 6,103 listings starting at $2,900
Used Audi A6"
145 Great Deals out of 6,632 listings starting at $1,995

Used Cars For Sale

2017 Volkswagen Passat For Sale
10,719 listings starting at $16,725
2016 Volkswagen Passat For Sale
13 Great Deals out of 2,154 listings starting at $12,795
2015 Volkswagen Passat For Sale
74 Great Deals out of 3,656 listings starting at $8,999
2014 Volkswagen Passat For Sale
33 Great Deals out of 746 listings starting at $9,895
2013 Volkswagen Passat For Sale
51 Great Deals out of 1,174 listings starting at $5,999