Question about 1996 Toyota Camry

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I have the check engine light on and I got a code P0420 what is this mean?

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Definition Catalyst System Efficiency Below Threshold Bank 1what does this really mean, well it means the Catalyytic converter is worn out and will need to be replaced.

Posted on May 03, 2010

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Posted on Jan 02, 2017

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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 ...

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    P0420 Error Code: Catalyst System Efficiency Below ...

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Jan 26, 2016 | Cars & Trucks

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Lincoln2004 aviator check engine light is on code read 420 what does that mean


I couldn't find engine code for 420 but may be body code take to AutoZone for free test and code meaning

Oct 12, 2014 | 2004 Lincoln Aviator

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Correct Engine Light PC 420, How?


If you mean P0420, the code means the catalytic converter is not functioning at spec.
The problem may be the converter, or the fuel system, or the cooling system. You may need a mechanic to check it out.

Sep 12, 2014 | Cars & Trucks

1 Answer

I have a 98 Mazda 626, error codes p0420 and p0505, anything that could cause both?


P0505 - Idle Control System Malfunction P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Apr 22, 2014 | 1999 Mazda 626

1 Answer

My check engine light is on, and the code is P0420, it's a Pontiac Grand Am. What does the code mean?


Go to Advance Auto. They have free troubleshooting of engine codes. The techs there can give you a list of causes for the code based on your automobile.

Dec 23, 2011 | 2003 Pontiac Grand Am

2 Answers

The vsc light and the trac off light and check engine light all came on at the same time code p0420 comes up on my 2005 highlander what does this mean?


A p0420 sets after Engine and catalyst are warmed up, vehicle driven within set vehicle engine speed range and waveforms of heated O2 sensors bank 1 sensor 1 and bank 1 sensor 2 have the same amplitude.
Catalytic convertor and O2 sensors need to be tested

Apr 24, 2011 | 2005 Toyota Highlander

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

P0420 code


This means that the secondary O2 sensor detects that the catalytic converter isn't working as efficiently as it should.
This engine code can be triggered by any one of the following:

1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.
2.) The secondary O2 sensor is malfunctioning.
3.) There is an exhaust leak.
4.) The computer unit is faulty.

Aug 24, 2009 | 2002 Toyota Camry

1 Answer

2001 chevy impala has a P0420 code and a check engine light that will not reset. Earlier P-codes indicated a problem with cylinders 1-3. these codes reset after a while. Found intake vacuum house off on...


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

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

Apr 04, 2009 | 2001 Chevrolet Impala

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