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1999 Dodge 1500. Put an Actron Diagnostic Analyzer on it and showed code P0420 Catalyst Efficiency Below Threshold. What does that mean. The problem is that the truck idles fine, but in drive at low rpm it will stall.

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The cat is not getting up to temp could be o2 sensor(upstream) or the cat itself

Posted on Aug 14, 2008

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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 ...

      mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie...
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    P0420 Error Code: Catalyst System Efficiency Below ...

    www.obd-codes.com/p0420
    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
    https://www.youtube.com/watch?v=-c8090n1Ihs
    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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Car sometimes will not start after sits for a day


Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

Jul 11, 2015 | 2006 Toyota Solara

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I have 1999 gmc new Sierra Z71 1500 4wd 4.8 8cil shows code P0420 what can I do to fixed


P0420 - Catalyst System Efficiency Below Threshold (it not cleaning the exhaust up)
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)

Oct 11, 2012 | Cars & Trucks

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1996 taurus p420 code


The P0420 means Catalyst System Efficiency Below Threshold (Bank 1), and the P0430 means Catalyst System Efficiency Below Threshold (Bank 2).
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ECU unlock immobilizer tool

Sep 17, 2012 | 1996 Ford Taurus

2 Answers

My 1999 Chev Tahoe will not start - Has codes p0430 and p0420


Hi Charlie,
Diagnostic Test Codes (DTCs) P0420 and P0430 ar "Catalyst Efficiency" codes. These simply mean that the catalytic converters in your vehicle are not performing the way they should be. To fix these codes, you will most likely have to replace the converters. However, these codes do NOT indicate why your engine wil not start. There are many things that can cause an engine to not start. Many of which may or may not set fault codes. You need to determine if the engine is getting fuel and ignition first then go from there.

Dec 17, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

What do these codes mean ? po430 po420 po306 for mercury cougar 1999


P0430 code is(catalyst efficiency below threshold on bank 2)
P0420 code is((catalyst efficiency below threshold on bank 1)
P0306 code is(cylinder 6 misfire detected)

Dec 13, 2011 | 1999 Mercury Cougar

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Troubleshooting code p0420


P0420 = Bank 1 catalyst system efficiency below threshold. This DTC (Diagnostic Trouble Code) is set when the O2 downstream sensor indicates/measures the amount of hydrocarbons/oxygen present in the exhaust after it passes through the converter. When this sensor detects exhaust gasses identical/near identical to the upstream O2 Sensor (the actual gasses at the exhaust port - before the converter), it will set this 'efficiency below threshold' code. The catalyst has failed to 'convert' the exhaust gasses to CO2 + Water.

Sep 11, 2011 | 2006 Hyundai Sonata

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Check engine light on. took the car to auto zone to put it on a scanner. trouble code p0420. catalyst system efficiency below threshold. probable cause; large vaccum leak, fuel system fault, ignition...


Diagnostic code produces P0420 catalyst system efficiency below threshold-Bank 1. Probable causes are listed as follows:
1-air leak in exhaust before rear 02 sensor, 3-Fuel system fault,
4-faulty catalytic converter.

May 31, 2010 | 2001 Nissan Altima

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