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Code p0420 suzuki sx4 2009 sport - Suzuki Cars & Trucks

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?

0 2 sensor near the catalytic converter or

replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

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Feb 03, 2017 | Cars & Trucks

2 Answers

What means catalyst Efficiency below normal

      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

      civic - Check Engine code P0420 Catalyst efficiency below ...

    P0420 Error Code: Catalyst System Efficiency Below ...
    P0420 OBD-II Trouble Code. Technical Description. Catalyst System Efficiency Below Threshold (Bank 1). What does that mean? This diagnostic trouble code ...

    P0420 Code Fix How Its Done Catalyst Efficiency Below ...

    ? 4:25
    Jun 20, 2014 - Uploaded by ACE AUTOS UK
    Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code ...

Jan 26, 2016 | Cars & Trucks

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What parts do i need to replace in 2005 suzuki grand vitara v6 2.7 with p0420 and p2628 ?

for the po420 need diagnostic posible cat converter or bad o2 sensors
for the p2628 dont know is no info on alldata

Oct 15, 2014 | Cars & Trucks

1 Answer

Shooting code #p0420

If you have an exhaust leak the hole allows the mixture that the secondary o2 reads to become high and will cause check engine light to come on. Fix the leak and reset the ecu by removing the negative bat terminal for ten seconds with one door open then reconn

Feb 12, 2014 | 2000 Mitsubishi Montero Sport

1 Answer

P0420 suzuki

This code indicates your catalytic converter has worn out. Check the numbers from the emission test to verify you exceeded hydrocarbon limits. If yes, replace the converter. Not sure why the light is not coming on. Could be a bad connection between the computer and the instrument panel.You would have to troubleshoot the computer connector to find the problem.

May 18, 2017 | Cars & Trucks

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How many miles do i need to drive to have the computer re-ready to accept obd codes?

200 miles is more than enough. p0420 is a cat code meaning the cat in the exhaust is not doing its job. you need to make sure there are no exhaust leaks before the downstream (last one) o2 sensor. if you can get all but 1 monitor to set without the check eng light coming on, you will pass pa emmissions.

Jun 30, 2012 | Suzuki Cars & Trucks

1 Answer


P0420 isnt a misfiring code; this code P0420 is refer at Catalyst System Efficiency Below Threshold (Bank 1).

Feel free to contact us if you need additional details to volve it clicking the link.

Oct 24, 2011 | 2002 Volvo S60

1 Answer

Engine code p0420

A code P0420 may mean that one or more of the following has happened:

•Leaded fuel was used where unleaded was called for
•An oxygen sensor is not reading (functioning) properly
•The engine coolant temperature sensor is not working properly
•Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
•Retarded spark timing
•The oxygen sensors in front and behind the converter are reporting too similar of readings

Some suggested steps for troubleshooting a P0420 error code include:

•Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
•Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
•Inspect the downstream heated oxygen sensor (HO2), replace if necessary
•Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Apr 02, 2010 | 2003 Suzuki Aerio

1 Answer

Error codes: P0420 AND P0446

the p0420 could and usaully is a bad converter.

May 28, 2009 | 1996 Oldsmobile Bravada

1 Answer

07 caliber p0420

Might still be under warranty. P0420 is a catalytic converter efficiency code. Usually this means the catalytic converter is no longer able to do it's job. The computer knows when it is failing and sets this code.

Check with your dealer to see if the catalytic converter might still be covered as it is an emissions component.

Feb 14, 2009 | 2007 Dodge Caliber SXT Sport Hatchback

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