Question about 2002 Mitsubishi Lancer

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2002 mitsubishi lancer, alarm code 421.

What are steps in troubleshooting this alarm code of 421

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Djjfkg

Posted on Jul 03, 2008

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Posted on Jan 02, 2017

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Why am i getting engine code p0421 on this 2002 mitsubishi lancer?


this code is lazy cat (or weak or dead)420's are very hard to diagnose
here is the order.
1: NO EXHAUST leaks near any oxy sensor. zero, (cracks, or gaskets) any where near or upstream of any oxy sensor.!!!
2: Engine runs perfectly CEL out running and no stored or live DTCS (besides 421) and engine holds closed loop at hot idle and light flat cruise, steady right foot, if not , the CAT gets punished.
3: good front oxz sensors, a mUST.
4: AND 2nd last , new rear cat sensors (421s come from this sensor)
5: a NEW cat.

that is the crash course, can do 100s pages.
but no. just 1.

Jun 28, 2014 | 2002 Mitsubishi Lancer

1 Answer

I got a p0340 troubleshooting code on my 2002 mitsubishi lancer. how dependable are the readings?


P0340--is the Camshaft Position Sensor Circuit.

These readings are very accurate..


Jul 23, 2011 | 2002 Mitsubishi Lancer

1 Answer

Want to disarm central locking horn alarm for 2002 lancer glxi


take the wire off the battery that goes to the alarm.

Jan 31, 2011 | 2002 Mitsubishi Lancer

2 Answers

Mitsubishi Lancer Need fuse box diagram, which fuse is what. My son bought this car and the owners manual was missing and he is having trouble figuring out which fuse works what. Thank you for the...


The Mitsubishi Mirage is a subcompact car produced by Mitsubishi Motors from 1978 to 2002. It was also sold as the Mitsubishi Colt or Lancer.

The following wiring diagram and electrical circuit/schematics manual provide detail information about the electrical system description, illustration and troubleshooting of Mitsubishi Mirage 1999 models: Mitsubishi Wiring Diagram

Hope helped.

Oct 16, 2009 | 2002 Mitsubishi Lancer

1 Answer

I need instructions on how to install a tacho in a 2002 cg lancer


We had tacho installation problem with out 98 lancer with no tacho on the panel. we got a aftermarket one but when we had to wiring it up it needed a tacho signle from the ignition coil. The ignition coil is built into the distributor which made it hard. The 2002 is the same distributor setup as the 98 so you can get step by step instructions with diagrams and pictures from my page, you will see an link that says Mitsubishi Tacho installation. website is www.sureyya.biz let me know if you find it useful.

Goodluck

Aug 22, 2009 | 2002 Mitsubishi Lancer

1 Answer

Alarm System on a 03 Mitsu Lancer


I bought a viper and I love it and its one of the best alarms. you can find some that are after market for cheap at least 200 bucks or less. but good luck they are not easy to install.

Jan 07, 2009 | 2003 Mitsubishi Lancer

1 Answer

Remote not working how to manually disarm alarm


did you get a different key for your alarm box if not thy the ignition key. joe

Nov 21, 2008 | 2002 Mitsubishi Lancer

1 Answer

Beeping alarm and indicators on when driving.


Is your alarm button sticking? Is it a factory alarm? Check the alarms program modes  Also it may be losing an ignition feed and resting itself

Sep 01, 2008 | 2002 Mitsubishi Lancer

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