Question about 2005 Toyota Corolla

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Check engine light came on recently. Car then

Check engine light came on recently. Car then started to pulsate while stopped and even died while driving. Toyota repair shop said it was the engine coil. Changed it and problem is still there. Now they think I had bad spark plugs put in during a tune up. Any thoughts?

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Is the Check engine light for a miss?

Posted on Nov 15, 2009

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The exhaust system has two 02 sensors One before the cat converter and one after. The #2 02 behind the cat converter is the one that trips the light if emmisions are unacceptable coming out of the converter. The #1 or front 02 sensor monitors and constantly adjusts the fuel to stay within parameters. If the #2 tries to compensate for an inefficient converter and it conflicts with the #1 02, the ebgine will run poorly due to either too rich or too lean fuel adjustment. Have the #2 02 sensor replaced and the converter checked. Good luck

Posted on Nov 15, 2009

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