2003 Mitsubishi Lancer "po421" Questions

My 2003 lancer has a trouble code po171 and po421 can you help there is a recall on the po421 so check with your dealer it a cat. converter code, po 171 is a lean code check for vacuum leak or worn ...

po421 and po456 mitsubishi lancer 2002. po421 warm up catalist efficiency below threshold. could be o2 sensor after converter, could be a bad converter, or bad plugs. po456 evaporative emission system

po421 also has code po441 po421 catalytic converter code [warm up catalyst efficiency below threshold bank 1] means the o2 sensor is detecting low oxygen in exhaust problem can be cat conv going bad--

How do I fix the PO421 code? I own a 1996 Ford Probe that hasd failed the e-check because of the PO421 code. What do I need to do to solve this issue? the trouble code means that the oxygen sensor is ...

Engine light on- PO421 Catalyst system bank 1 taken from: http://forums.evolutionm.net/lancer-troubleshooting/349095-code-p0421-call-mitsu-before-you-do-anything.html Code P0421- Call Mitsu before you

NEED TO KNOW WHAT IS THI P0421 ERROR CODE ERROR CODE P0421 PO421:Warm Up Catalyst-below threshold (bank #1) CEL

REplaced the cat and 02 sensors. Did the recalls. Also did a tune up, excluding the fuel filter. PO421 code is on again. Checked for exhaust leaks and vacuum leaks. Flushed the injectors. Next is ...

2002 mitsubishi lancer code po421 P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1) Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting ...

code po421 how to fix I have a 2003 eclipse 2.4 liter. Got a code po421 when i took it in for inspection.(po421 is the warm up catalyst efficiency below threshold-bank-1)How do i find out (1- what ...

PO421 PO421-Converter Efficiency Below Threshold (Bank 1 ) Your exhaust converter has failed in 8 or 9 years,instead of the expected 12 to 15 You have to find out why,before replacing it