Question about 1996 Mazda Protege
Failed TN emissions testing. 1996 Mazda Protege 216,000 miles
Monitors not ready.
Check engine light OFF; light tests OK at startup.
Most/all sensors replaced. EGR also.
Dealer tester says all is OK but still fails.
Replaced battery terminals due to ??? (intermittant?) when checking battery at the terminals & now accumulating miles to clear monitors. Battery checks OK at posts.
Definitely have driven many miles after shopwork before emissions testing. (500 - 1000 depending on when)
The computer needs to be reset by performing a code erase then drive 500 miles
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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The check engine light/service engine soon (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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