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Posted on Jul 03, 2008

2002 mitsubishi lancer, alarm code 421.

What are steps in troubleshooting this alarm code of 421

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2002 Mitsubishi Lancer. When I reconnect battery alarm goes off.

Question edited for clarity.
Question moved to category.

The alarm and immobilizer needs to be reset. It is not as straightforward as normal. You may need an auto locksmith.

https://www.google.com/search?q=how+to+reset+mitsubishi+lancer+alarm

..
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My 2002 Mitsubishi Lancer Cedia G.D.I. changed the transmission and the check engine light is flashing and no acceleration why is this happening?

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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.

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P0340--is the Camshaft Position Sensor Circuit.

These readings are very accurate..


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