Low efficency - XC90 Volvo Cars & Trucks

no --cat converters cannot be cleaned
go to an accredited muffler shop and have it replaced

that is a low efficency bank 1 catalyst code, basically you need a new catalytic convertor

Exhaust Converter on Bank #1 side, is worn out,needs
to be replaced

PO420 &PO430 are Converters Below Efficiency

Should have lasted another year or two

I suspect you don't keep up on what the car
required,air filter,spark plugs,O2 Sensors & the like.

Your fuel trim & ignition issues over the years ruined it

Any PO420 or PO430 Codes---means your exhaust converter is

below efficency,time to replace,worn out,won't pass inspection.

po420 = catyalic converter low efficency, this means the converter is not working good, this can be caused by a bad converter or bad o2 sensors, you will need to have a scan tool hooked to computer and preform testing to see if it is the converter or bad o2 (oxygen sensor) sensors. hope this helps.

could be slightly low on charge-or cooling fan is not working-as the temp outside goes up the ac needs to be more efficent to blow cold air--and really 55 is not that cold--depending on outside conditions should be able to blow at low to mid 40 s

evap canister leak or leaky vacuum hose.

sound like a injector problem

The parking break is a stand alone cable that can be adjusted if you climb under the vehicle. depending on your parking break location in the cab will help you better locate it under the car IE if you set your parking brake using a handle in the center of the vehicle cab, the wire is close to center under the vehicle, if you use a handle or foot pedal its on the driverside of the vehicle and Y's off to the passager side and driver side rear break

EX:
/
-------------------------------------<
\

follow the cable and you will find the adjuster bolt, just tighten it to take up slack in the cable, if there is no slack you will increase the efficency of the parking break.....Dont over tighten it though cause this can cause drag in the rear breaks and shorten the lifespan of the break shoe or pad

Your number 1 O2 sensor is bad replace it. this is the O2 sensor attached to your headers. Could be faulty sensor or the air/fuel ratio is offset. But replace the sensor its not running effeciently.