How to repair p0420 - 2005 Chevrolet Avalanche

You need service and repair manual with diagram which will provide you step by step help to locate and fix the problem easily and you will get the manual from the given link Home Toolsnyou

Do you know what a catalytic converter is ? P0420 How To Diagnose Bad Catalytic Converter EricTheCarGuy Your best bet , take your vehicle to a qualified repair shop that knows how to diagnose this P0420 code .

Pesky PO420 Codes - Eastern Catalytic

www.easterncatalytic.com/education/tech-tips/pesky-p0420-codes/

One of the most annoying is the persistent PO420 diagnostic code (Catalyst System ... not only shows its teeth when the catalytic converter is on the blink, but can also be ... Most, if not all, catalytic converter failures are caused by a problem or ...

P0420 Error Code: Catalyst System Efficiency Below ...

www.obd-codes.com/p0420

Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency ... If they have failed, it is likely due to something else that caused it to fail. ... the catalytic converter is broken or failed, it may be restricting the exhaust which will ...

explaining trouble codes po420 - po421 - Discount Catalytic ...

P0420 Catalyst System Efficiency Below Threshold Bank 1 Probably the cat is bad .You need to have it tested How To Diagnose Check Engine Light Code P0420 Catalyst Bank 1

Hi. Please concentrate on fixing p0068. this is to do with airflow and fuel/ mixture. maybe air mass meter. these can cause faults p0420 and 0430 to come on. after p0068 is repaired clear all faults and take the car on a long drive to clean out the cats, reassess if the cats are actually faulty at a later date.

This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1

Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

P0420 CHRYSLER - Catalyst System Efficiency Bank 1 Low
Possible causes- Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) Tech notes The most common cause it the three way catalyst converter Bank 1 is worn out. Changing just the O2 sensor/Catalytic efficiency monitor usually doesn't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

the following links can assist you with causes and repair
P0420 Catalyst System Efficiency Below Threshold https://www.autocodes.com/p0420.html P0420 OBD II Trouble Code

P0420 is Catalyst System Efficiency Below Threshold (Bank #1)
Trouble area:
- gas leakage on exhaust system
- oxygen sensor
- three-way cat. converter

http://manual.shulsmann.com/Repair%20Manual/05/200o8c05/dtcc4000.pdf (see page 2)

http://manual.shulsmann.com/Repair%20Manual/05/200o8c05/cip0420.pdf

It sounds like one of your catalytic converters doesn't appear to be working up to par if you're getting this error code.

P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1) Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
www.obd-codes.com/p0420