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So I have a 14 chevy cruze throwing the p0420 code I replaced the 02 sensor before the cat, that worked for about 2 months and just came back on thismorning with a puddle of coolant. After trying to find the leak all i could come up with was little drips here n there off the flex hose right where it connects to the cat. I have fixed so many coolant issues with this car and am stumped. I was kind of leaning towards the turbo from what I have been researching. If anyone has advice I would greatly appreciate it. Thank you.
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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So I have a 14 chevy cruze throwing the p0420 code
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


I replaced the 02 sensor before the cat, that worked for about 2 months and just came back on thismorning with a puddle of coolant. After trying to find the leak all i could come up with was little drips here n there off the flex hose right where it connects to the cat.
Which hose?
Vehicle Car Automotive air manifold Automotive design Personal luxury car



I have fixed so many coolant issues with this car and am stumped. I was kind of leaning towards the turbo from what I have been researching. If anyone has advice I would greatly appreciate it. Thank you.
Check the water outlet. Gently squeeze the hose and water outlet where the guys thumb is to start.

Hood Green Automotive tire Motor vehicle Vehicle
 

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