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How to get check engine codes off a 1990 pontiac grand am and where is the connector located to plug a scanner?

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  • Pontiac Master
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Have great news for you. Since you have a obd1 system, you don't need a scanner to read your DTC codes and reset your check engine light. Here is a link that should help you, good luck and keep me posted. Be glad to help you get your Pontiac running 100% again.  http://www.troublecodes.net/GM/

Posted on Sep 30, 2009

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What is code reader compared to scanner what does each one do


Code reader just reads codes. Won't give you live data. Only a scan tool can do that. But you can read the codes of a 1990 vehicle with just a paper clip and counting the check engine light flashes. Very little live data was available back in 1990. Buying a scan tool for that car would be a waste of money.

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Not able to locate plug to put scanner on for any trouble codes.


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Feb 20, 2014 | 2002 Suzuki Grand Vitara

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One of the engine cylinders is mis firing (did a code check). the check engine light initially flashes when first driving, then remains on -does not flash any longer) would that damage the catalytic...


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Dec 24, 2010 | 1990 Pontiac Grand Prix

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Where is the computer located on 1990 pontiac grand prix


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I ran a scanner on my 2002 pontiac grand prix 3100 V6 and it reads out as multiple misfire i already changed the spark plugs,what could the problem be?


A code “multiple misfire” may mean that one or more of the following has happened:

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Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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Where is the diagnostic plug to get codes from check engine light


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