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Doug
Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6899
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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A couple of things. I have to do the on board diagnostics

Customer Question

A couple of things. I have to do the on board diagnostics because we replaced the alternator and it's not ready to be smogged, but when I was driving it yesterday the service engine soon light came on again
JA: Do you have the trouble code? Do you have a code reader or scan tool?
Customer: I just replace all 4 oxygen sensors a couple of months ago
JA: I'll pass this info along to the Mitsubishi Mechanic so that he can get you a quick fix. What is the model/year of your Mitsubishi?
Customer: maybe once I do the diagnostics thing it will take care of it?
JA: What year is your Mitsubishi?
Customer: '02
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: mostly my step-dad is
JA: Anything else you want the mechanic to know before I connect you?
Customer: No I need to get it smogged to get it registered and they won't do it with that light on. It is running great
Submitted: 1 month ago.
Category: Mitsubishi
Expert:  Greg replied 1 month ago.

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

Expert:  Greg replied 1 month ago.

Model and Engine please .

Have you checked for malfunction codes .

Just clearing codes will not switch off the Check engine light you have to get codes (Free at autozone)

from the codes we will then know what we have to repair .

Just clearing codes will not help at the smog inspection because they check the ready monitors .

Get back to me with codes for further assistance .

RgdsGreg

Customer: replied 1 month ago.
It's not throwing any codes. We got the light to go off, then I took it to smog it, but it wasn't "ready" so I was driving it more to bring up more memory into the computer that had been lost when we replaced the alternator and while I was driving it the light came back on. I give up!!
Expert:  Greg replied 1 month ago.

The light is going to come back on again as soon as the system get to ready .

The idea is that the car has to run though all needed drive cycles to see if all system are running correctly .

if any sensor or system is malfunctioning then the check engine will come back on.

What scan tool are you using .

Greg

Customer: replied 1 month ago.
I will find out today it's my stepdad"s and he is bringing it over to check it again today
Expert:  Greg replied 1 month ago.

Okay sounds good , get back to me when you can .

Greg