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My car runs fine but when I come to a stop my idle drops and sometimes dies.
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asked
Jan 31, 2017
by
Josh
P0420 code came on and I changed both 02 sensors and my car is running the same. When I come to a stop my idle drops and all my lights come on and wants to die. Not sure what my problem is ???? any ideas???
Vehicle:
08 Subaru Impreza 2.5 non turbo
code
p0420
subaru
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Feb 1, 2017
by
Carguy1
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Hi there,
first, this code is for a bad catalytic converter. Even though you changed the O2 sensors, if you are still getting this code it does indicate there is a problem with the converter.
Second, you may have a faulty mass air flow sensor. Sometimes when they fail it will cause the car to stall because the computer doesn't make the right fuel mixture.
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