Check engine light

Asked by May 12, 2016 at 05:49 PM about the 1999 Dodge Durango 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

My check engine light came on and my friend told to
check the oil and stuff and everything was fine so I scan it
with my obd2 it game p0420 and so early today I unplug
my battery to some stuff and when I turn on my car it was
off my question is. Is there still something wrong or not
since the light is off

4 Answers


You did clear the light when you unplugged the battery, but didn't fix the problem that's setting the code off. The light will come back if you don't fix it. just have an O2 sensor that needs replacing...fairly common. However, if this is the sensor behind the catalytic converter, even if it's bad you shouldn't have any driveability issues, even with the light on. But if you have to have your vehicle inspected for emissions, you better replace it or you will certainly fail.

I figure it didn't say which o2 it was but I think might be the one after catalytic converter

Also so if the light doesn't come on it mean it fine right

I replaced my CO2 sensor, have a rebuilt engine, a rebuilt transmission, new catalytic converter, new battery, new front end suspension, new tires, alignment and my engine light is still on!! Please help me. Mine is also a 1999 Dodge Durango with the largest engine 5.9 4 wheel drive- does anyone know what it might be?

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