I purchased this 2010 Chevy Aveo for my Dad in April. It had no lights on, low mileage, and seemed like a nice little car, for the first two weeks. After that, it's been a sea of codes, troubles, and aimless replacements of things that aren't helping the cause. I'm in desperate need of fixing this, as it's due to be inspected at the end of the month. I'm going to list the codes I've received and the things that I've replaced, and if anyone has any insight, I'd be beyond grateful to hear it.
P0420 Catalyst System Efficiency Below Threshold Bank 1
P0137 02 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0341 Camshaft Position Sensor "A" Circuit/Range
P00B7 Engine Coolant Flow Low/Performance
For code P00B7, I discovered I had a missing O-Ring in my coolant cap, and replaced the cap. Also did a coolant flush, and replaced the thermostat housing assembly, and throttle body heater inlet pipe (I think it broke in the changing of the housing).
Then P0341, P0137 and P0420 have been my stubborn codes.
I've replaced the Crankshaft position sensor and Camshaft position sensor. Replaced the 02 sensor upstream and downstream, replaced the manifold catalytic convertor, and the rear catalytic convertor. Changed spark plugs and wires, ignition coils,
It had some hesitation in the brakes, and a stiff pedal, so I replaced the Brake Booster and the brake booster vaccum hose. It has new brakes and I'm still not seeing any improvement. The TPMS light is on, so I got new sensors, and the airbag light keeps coming on and going off, it's an intermittent issue. This car has been a special case to say the least. It doesn't have that many miles on it, when it's not lit up like a Christmas tree it seems to be a nice riding car. I'm at a loss.
I don't know if these are related or separate. But I do know that I'm at my wits end over the P0420 code. I don't know what else to try. I even read something in the forum about trying a spark plug non-fouler with the 02 sensor and we've tried that with no luck as well.