Questions & Answers for: fix code p0421

P0421 code on recently purchased(from dealer) 2002 RS Have a 2002 Eclipse RS which I just bought from a dealer...The "service engine soon" light came on...OBDII code P0421, and a P0421 pending. ...

...Fix P0304, if P0421 returns you will need a catalitic converter P0455 is an Evaportive emission leak. Be sure you gas cap is tight and secure. If it is ok, then there is a leak in the

...stuck - may be caused by the O2 sensor, but may not I recommend replacing your O2 sensor first and see what happens I have a P0304 and P1512 code for my Mazda mpv 2001. Can you help me how to fix

...code-p0421-call-mitsu-before-you-do-anything.html Code P0421- Call Mitsu before you do anything! I called my nearest dealership today and for those who dont know, if your check engine light is on and ...

...converter is not working properly (not a big deal) and the second code means you had a random misfire in the engine, the site i gave explains all and tells you how to fix the problem hope i ...

...code p0421 so how do i fix it email me at [email protected] tell me the causes and the solutions my 2001 mazda 626 V-6 have a error code p0421 & P0421 so how do i fix it. tell me the causes and ...

...code P0421 how to fix it. which o2 sensor gets replaced? P0421: Warm Up Catalyst Efficiency Below Threshold (Bank 1). This could apear because of a bad O2 sensor on the catalytic converter on bank 1. ...

fix this issue I get a OBD11 code of P0421. I have removed and replaced spark plugs and the vehicle is running great. I still get the check engine light with the same code. I did clear the code twice.

...fix. I'm almost positive it can't be as simple as deleting the codes,i'm just not that lucky........ P0305 - Cylinder number 5 misfire detected. Probable faults and reasons: Igniter no. 5 defective. ...

...Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. Call Toyota Care or consult Authorized Service