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2014 LT program car, Pull Me Over Red, 1.4T Auto
13,868 Posts
Just bought this car for wife and have same code any thoughts?I'm thinking first sensor before cat because of the fuel ratio being off?
BTW Im having mixed thoughts about the car just had the turbo manifold just replaced at 135k bought it used from dealership
2014 1.4l turbo other than little **** car runs good
Welcome Aboard!(y)

A code P0420 may mean that one or more of the following has happened:

Leaded fuel was used where unleaded was called for (unlikely)
A damaged or failed oxygen / O2 sensor
Downstream oxygen sensor (HO2S) wiring damaged or connected improperly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe
Failed or underperforming catalytic converter (likely)
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings
Leaking fuel injector or high fuel pressure
Cylinder misfire Oil contamination
Read more at: P0420 Catalyst System Efficiency Below Threshold

Don't forget to introduce yourself and your Cruze here.
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