My 2001 Dodge Caravan started running poorly after I got gas and the check engine light came on soon after. The OBD codes are P0302 and P0420. I have changed all the spark plugs and plug wires but it still has the problem. Would someone please let me know what steps I need to take next to diagnose the problem and ultimately fix it.

2000 Toyota Corolla, P0171 & P0420 codes - YouTube

? 5:43
https://www.youtube.com/watch?v=ahJnJ19-vwY
Jun 13, 2011 - Uploaded by StandardBrandParts
Standard Motor Products presents: Technician's Toolbox "2000Toyota Corolla, P0171 & P0420 codes"

Smoke testing for codes P0171 P0174 - YouTube

? 5:48
https://www.youtube.com/watch?v=kZsqEfP-5zM
Jan 18, 2011 - Uploaded by realfixesrealfast
These two codes mean a V style engine is running lean on both banks. So you have to be thinking - what can ...

How to repair fault code P0171 and reset warning light ...

? 26:31
https://www.youtube.com/watch?v=Y8FBGrCT3rM
Nov 27, 2014 - Uploaded by Peter Finn
How to repair and fix fault or error code P0171 and reset warning light Toyota Corolla VVT-i engine. ... Also how to find fault codeusing OBD scanner. ... Trouble shooting a misfire, Code P0300, P0301, P0302, P0303, P0304, P0305, P0306, ... 2000 Toyota Corolla, P0171 & P0420 codes - Duration: 5:43. by ...

Cylinder 2 misfire

The p0302 is a misfiring code. It could be plugs or coil pack. The p0420 code reads Catalyst System Efficiency Below Treshol. I would start with the plugs that is the cheapest route to start out with.

Code P0302? Who told you that? If you have a scanner or someone with access to one, you know what to do.

P0302 is a misfire in cylinder #2. When was the last time you changed spark plugs? That's the most common cause of a misfire.

Take it to Advance Auto Parts, or Auto Zone, they will scan your computer for free to get the code and tell you what it means. May just be a sensor, or the gas cap isn't tight (emissions) may or may not be serious. Thanks.

all codes are emsions codes you can look them up on this site and they also give probably fixes http://www.obd-codes.com/p0420

2001 Dodge Caravan FWD
3.3 liter V-6 VIN "R"Cylinder # firewall, Passenger to drivers side, 1-3-5
Cylinder # radiator, Passenger to drivers side 2-4-6

Coil Block post # firewall, Passenger to drivers side 5-1-3
Coil Block post # radiator, Passenger to drivers side 2-4-6

Good luck

Visit http://www.troublecodes.net/OBD2/

Hi, I look for Aztek information and I've just seen your problem on fixya.com

I give you an adress that will probably helful.
Have a nice day

http://www.obd-codes.com/p0420