P CODES (POWERTRAIN) P0400 - P0499 P0421 Questions

Code P0421

2004 DODGE STRATUS

5 ANSWERS

6 IMAGES

Asked by Robhaynes84

Codes P0421 And P0431

2009 PORSCHE CAYENNE

1 ANSWER

6 IMAGES

Asked by pengrr5200

2006 Mitsubishi Galant Code P0421

2006 MITSUBISHI GALANT

9 ANSWERS

8 IMAGES

Asked by Diaz764

2001 Mazda MPV PO421 CODE

2001 MAZDA MPV

1 ANSWER

Asked by demetriswilson000

2000 Mitsubishi Galant OBD Code PO421

2000 MITSUBISHI GALANT

7 ANSWERS

Asked by skykings44

I Have One Confirmed P0421 Code And One Pending Code...

2004 HYUNDAI SONATA

3 ANSWERS

1 IMAGE

Asked by vish4369

2001 Hyundai Santa Fe OBD II Code P0421 Problem

2001 HYUNDAI SANTA FE

5 ANSWERS

Asked by jorge10928

PO421

1942 MITSUBISHI OTHER

4 ANSWERS

Asked by quinny24

Trouble Code P0421

MAZDA 626

3 ANSWERS

Asked by irish81449

P0421 Code Please Help?

2005 MITSUBISHI LANCER

2 ANSWERS

Asked by wangnnfnn