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Anonymous Posted on Jul 14, 2014

What causes01 audi allroad 2.7 liter fault code p0421

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chris marchese

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  • Contributor 48 Answers
  • Posted on Jul 29, 2014
chris marchese
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This can either be a bad cat or o2 sensor its the after cat downstream driver side you can either replace the o2 sensor or buy a spacer from 034 Motorsports to get rid of this problem or get a tune alls it does is checking if the cat is there for emissions will not effect gas mileage. Owner of Audi A6 2.7T 2001.B2 S1 is drivers side pre cat

B1 = Passenger side
B2 = Drivers side
S1 = Pre cat
S2 = Post Cat Example s1:b1

5 Related Answers

Anonymous

  • 79 Answers
  • Posted on Apr 07, 2009

SOURCE: Audi A6 Allroad

jack the car up saftely then take the wheels off .. then you will see the brake calipier turn the wheel towards you so the calipier is facing you . at the bottom of the calp you will see a small bolt at bottom undo this and lift prize the calp up then remove 1 pad the inside on where the piston is then put calp back down and put the bolt back in just to hold it in place then when you have done this put a large stronge screw driver in via hole in front to push the piston all the way back but make sure you do the evenly and piston goes in straight or it will get stuck same with all types of brakes. once you have done this reopen calp and take the other pad out clean all area with a wire brush and replace the new pads in place,, and retighten bolt etc , before you start the other side please make sure you pump brake peddle until it goes hard again. then do same to over side ,

hope this is a great help matdav69

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ZJLimited

ZJ Limited

  • 17989 Answers
  • Posted on Apr 16, 2010

SOURCE: What is the factory car stereo code for 2001 Audi

The RADIO CODE is the security number from device car; generally this is located in the stocker label in back side radio or in the last page of the owners manual. If you dont find it, need call to the delaer and with the VIN and Serial number they can send it to you (sometimes you need to pay for this service).

Hope help.

Anonymous

  • 27 Answers
  • Posted on Jun 29, 2010

SOURCE: How do i diactivate jack mode in an Audi Allroad

Hold upper and lower arrows at same time for about 10 seconds to activate and deactivate jack mode. OR start driving car and it will automatically deactivate I believe when speeds are sensed above 5 mph.

Anonymous

  • 27 Answers
  • Posted on Jun 30, 2010

SOURCE: p0431 code on audi allroad 02

Typcally caused by one of the front oxygen sensors or a bad ground associated with these sensors.Replace both front sensors with direct fit type NOT universal, because there may be a cracked wire and the universal sensor does not contain the complete wire harness. Direct fits, are about $20 more than universal fit type.

The O2 sensors have integrated heating elements that bring them up to the proper operating temperature. Code P0431 indicates that the O2 sensor on your driver side catalytic converter is not reaching the proper operating range. The O2 sensors are usually in the $150 range online.

Anonymous

  • 27 Answers
  • Posted on Jun 30, 2010

SOURCE: How do i diactivate jack mode in an Audi Allroad

Hold upper and lower arrows at same time for about 10 seconds to activate and deactivate jack mode. OR start driving car and it will automatically deactivate I believe when speeds are sensed above 5 mph.

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taken from: http://forums.evolutionm.net/lancer-troubleshooting/349095-code-p0421-call-mitsu-before-you-do-anything.html

Code P0421- Call Mitsu before you do anything!
Icalled my nearest dealership today and for those who dont know, if yourcheck engine light is on and its showing fault code P0421 this may befrom a factory recall on the warm-up converter and a PCM reflash.MILEAGE OF THE CAR DOES NOT EFFECT THIS RECALL. Anyone whos had problemwith a dealership not doing the repairs because of mileage needs tocontact another dealer or the owner of the dealership. This is what theservice manager told me today so though I'd share. Getting mine fixedtomorrow at 10am, I cant wait.

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