Questions & Answers for: Volvo S40 p0420

codes p0303/p0420/p0700 what mean that P0420 Catalyst system below Efficiency Threshold (Bank1) p0303 Cylinder 3 Misfire Detected p0700 Transmission Control System Malfunction

ENGINE LIGHT ON S40 VOLVO TOOK IT TO AUTO ZONE WAS ADVISE THE WAS CODE P0420 WHAT IS THAT? o2 sensor

p0420-what does that mean I have a 2002 Volvo s40. And that code came up and is makin my car fail smog. What is the problem and how do I fix it Catalytic converter efficiency. i'm having the same ...

what is p0420 on a volovo s40 Catalytic converter efficiency. Replace the catalytic converter. i'm having the same problem did you ever get that trouble code to go away?

fault codes p0420 for a 2006 volvo S40 is there an update to fix a 0420 P0420 indicates Catalytic convertor not efficient. could be rear sensor. Guaranteed fix is to remove the rear sensor and ...