Question about 2003 Jeep Liberty

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Code po420 keeps popping up it says its a left bank catalyst failure i took it to a muffler shop and wAS TOLD THRE IS NOTHING WRONG BUT THE LIGHTS STILL ON

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Make sure that O2 sensors are good if access to scanner look at live data and if both O2 sensors are switching about the same the catalitic convertor should be replaced

Posted on Nov 15, 2009

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There's a new answer to your Jeep 2008 Patriot question! Author image Bogdan Odwazny wrote: The code is po420? This was your reply to my first question some time ago. The answer is YES the c


EOBD II Error Code: P0420
Description:
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Causes:
- Leakage in Intake and/or Exhaust System.
- Catalyst faulty.
- Oxygen Sensor(s) faulty.
- Oxygen Sensor(s) Control faulty.

Solutions:
- Check Intake and Exhaust System for Leaks.
- Check Catalyst.
- Check Oxygen Sensor(s).
- Check Oxygen Sensor(s) Control.
- Perform Oxygen Sensor(s) Aging Check.
Hope that works.

Dec 03, 2014 | 2008 Jeep Patriot

1 Answer

Where should i find this sensor P0342?


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up (masking the original reason for converter failure).

Nov 04, 2012 | Chevrolet Epica Cars & Trucks

1 Answer

What does a po430 code mean on a mercury cougar


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up

Nov 04, 2012 | Cars & Trucks

1 Answer

Po420 left bank catalyst failure the muffeler shop said it was ok but the light remains on


Catalyst System Efficiency Below Threshold Bank 1,
Is telling you that the drivers side converter is not efficient in emission control,It's probably starting to get plugged up.

Nov 14, 2009 | 2003 Jeep Liberty

2 Answers

Check engine light on. P0325, P0420 2000 Subaru


CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR

Nov 13, 2009 | 2000 Subaru Outback

1 Answer

I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340


P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

May 29, 2009 | 2000 Chrysler Concorde

1 Answer

PO420" Catalyst efficiency low Bank 1"


Replace the catalytic converter.

Mar 09, 2009 | 1999 Acura TL

1 Answer

THE CHECK ENGINE LIGHT ON MY MINIVAN 02 SIENNA IS ON, AFTER I TOOK IT TO AUTO ZONE I WAS TOLD THAT IT COULD BE THE O2 SENSOR, CODE PO420 , CATALYST EFFICIENCY LOW BANK 1. BUT THEY WERE NOT SURE WICH ONE IT...


The FIRST thing that I would do would to get some really good fuel injection cleaner introduced into the fuel. Go and find some BG 44-K. This is the BEST stuff available. Fill up the tank, and dump in the BG 44K, Run the tank down as fast as possible. I use the BG product in my shop; it really works. Don't buy a Cat until you try the BG.

Mar 04, 2009 | 2002 Toyota Sienna

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