Question about 1998 Ford Explorer

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P0420 Catalyst System below threshold (Bank 1)

I failed inspection . How do this problem get fixed?


Thank you.

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  • Anonymous Mar 18, 2014

    Check light on

  • Anonymous Mar 27, 2014

    po430 mod 10 cateffciency below threshold bank 2 where is bank

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Replace the O2 sensors . they have one in the front and one in the back of the Catalytic Coverter pipes.Scan the SUV again to see if the codes were cleared.Meaning no "check engine light" on.

Posted on Jan 11, 2009

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Posted on Jan 02, 2017

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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 ...

      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

1 Answer

Sir,help me I have 2004 Toyota sienna van XLE ..my engine light was . c1201 ,c1223, c1224, u0123 u0124 u0126 P0430 P0420 Thanks Mr felix


c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

Jun 02, 2015 | Toyota Cars & Trucks

1 Answer

P0420 code evap system


This is not an evap code. Read on:
P0420 - Catalyst System Efficiency Below Threshold Bank 1

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)
Tech notes The most common cause it the three way catalyst converter Bank 1. Changing just the O2 sensor usually don't repair the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

Nov 02, 2012 | Cars & Trucks

2 Answers

Check engine light on, code reads p0420


Hi and welcome to FixYa!

Code p0420 means Catalyst System Efficiency Below Threshold (Bank 1). This will surely needs attention to resolve the problem.

Hope this helps and thank you for using FixYa! Have a good one!

Jan 26, 2011 | 1999 Buick Century

1 Answer

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

3 Answers

I had my car inspected and received P0420 code? what does it mean?


P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1) Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
www.obd-codes.com/p0420

Feb 18, 2010 | 2000 Toyota Celica

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

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