Can catalytic converter cause a PO65O code - Cars & Trucks

The PO420 code is a generic code indicating a problem with the catalytic converter system efficiency below threshold. This issue can be caused by several factors, including:

1. A clogged or failing catalytic converter
2. An exhaust leak before the catalytic converter
3. A malfunctioning oxygen sensor
4. Fuel system issues, such as a clogged fuel injector
5. Engine misfire
6. A damaged or failing ignition system
7. A vacuum leak

Here are the steps you can take to diagnose and fix the issue:

1. Check the catalytic converter: If the converter is clogged, it may need to be replaced.
2. Examine the exhaust system for leaks: Leaks before the catalytic converter can reduce its efficiency. If a leak is found, it should be repaired.
3. Replace the oxygen sensor: If the oxygen sensor is malfunctioning, it can cause the engine to run too rich or too lean, which can affect the catalytic converter.
4. Check the fuel system: Clogged fuel injectors can cause a lean fuel mixture, which can harm the catalytic converter. Have the fuel system checked and cleaned as necessary.
5. Repair any engine misfires: An engine misfire can damage the catalytic converter over time. Fix the misfire and see if the code returns.
6. Check the ignition system: A faulty ignition system can cause a misfire and damage the catalytic converter. Have the ignition system checked and repaired as needed.
7. Find and fix any vacuum leaks: Vacuum leaks can cause a lean fuel mixture and damage the catalytic converter.

It's best to have a mechanic diagnose the problem and perform the necessary repairs, as some of these repairs can be complicated and require specialized tools.

Did you reset the code?

Try some of this to clean the fouling in the rest of the system,

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P2176 is the Throttle Actuator Control System
See the hyperlink below for info on this code:
http://forum.grrrr8.net/showthread.php?t=14603

P0420 is Catalyst System Below Efficiency (i.e. catalytic converter on the exhaust system.)
To check your catalytic converter, get a very light, small finishing nail hammer and tap the catalytic converter lightly, if you hear rattling inside it then it's shot. If your exhaust pipes are rusted through anywhere, get it all done at the same time. You can DIY using parts from Walker Muffler... schematics are available on line, get new hangers too!

Trouble Code: P1113

O2 Control (Bank 1 Sensor 1) Internal Resistance Too High
Possible Causes:


Oxygen sensor (before catalytic converter) is faulty. Oxygen sensor (behind catalytic converter) is faulty. Oxygen sensor heater (before catalytic converter) is faulty. Oxygen sensor heater (behind catalytic converter) is faulty. Circuit wiring has a short to power or ground. Engine Component Power Supply Relay is faulty . E-box fuses for oxygen sensor are faulty . Leaks present in the exhaust manifold or exhaust pipes. HO2S signal wire and ground wire crossed in connector . HO2S element is fuel contaminated or has failed. ECM has failed .Here is what is listed.

p0420 is a catalytic converter efficiency code. It sets when thecm determines that the catalytic converter is no longer doing its job. The usual fix is to replace the catalytic converter. An O.E. or an aftermarket direct fit converter from a reputable manufacturer is your best bet. Lesser quality brands will leave your pocket book lighter to start but will cause more problems than they solve.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

P0431 Warm up catalytic converter, bank 2 - efficiency below threshold
Possible causes: Catalytic converter, wiring, HO2S 2

Usually caused by worn out catalytic converter, but always check fuel pressure regulator for proper operation before replacing a converter.

P0446 Evaporative emission (EVAP) system, vent control -circuit malfunction
Possible causes: Wiring, EVAP canister purge valve, ECM

May be caused by a loose or disconnected wire to the vent valve or possibly a bad valve solenoid

If you would like part locations, troubleshooting or replacement procedures, please let me know.

This code means the Catalytic converter on bank 2 is not working efficiently. If your car is acting up with hesitation the Catalytic may be getting fouled by the way the engine is running. There may be another Code to read for the problem that caused the Catalytic converter to foul.

You have between 25 and 35 Startups before a Code is erased. Consider the Code 430 as the last Code recorded and the other Codes were beyond the 25 to 35 Startup limit.

You have several choices. (Autozone and Oreillys give free scans) There are fuel additives which claim to clean the fuel system and Catalytic converters. You can have the car put on a better machine at a Dealer to find the cause of the hesitation. BUT tell them you want the type of test for cylinder balance and timing issues, not just Code numbers.

Once you restore the engine to Specs, the Catalytic converter may clean itself over time.

2001 Audi A6
EOBD code: P0420
Fault location: Catalytic converter system, bank 1 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

EOBD code: P0430
Fault location: Catalytic converter system, bank 2 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

CODE PO420 CATALTYLIC CONVERTER SYSTEM FAULT.ITS SAYING FAULTY CATALTYLIC CONVERTER.IF IT BEEN A WHILE IF YOUR CAR HAS A WHOLE LOT OF MILES ON IT.YOUR SPARK PLUG CHANGE IS DUE AT 120000 MILES. DUE A LITTLE TUNE UP CHANGE AIR FILTER AND FUEL FILTER.SEE IF YOU HAVE ANY ENGINE FAULTS BAD PLUGS DIRTY INJECTORS ANY THING UP SET FUEL SYSTEM CAUSE CAR TO RUN RICH.EXCESSIVE UNBURN FUEL WILL GATHER IN CATALYTIC CONVERTER CAUSE IT TO BURN OUT.SHORTING LIFE OF THE CATALYTIC CONVERTER.