Question about 2000 Jaguar S-Type

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Check System Light ON

How can affect the car if "Catalyst System Efficiency Below threshold (Bank1) P0420" message appears on the Smog test shop computer, after a Check system light turn ON.
The light was ON after it passed the test.

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This message is displayed to let you know that the catalyst is not performing to standards as outlined by manufacturer. this can be caused by the precious metals in the catalytic converter breaking down due to a possible lean condition or overfueling. this can also be caused by normal wear and tear too. hope this info helps!!

Posted on Sep 04, 2009

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What means catalyst Efficiency below normal


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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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O2 sensor problems o2 sensors set po 420 code. both sensors have been replaced


The problem is NOT the O2 sensor, this code (p0420) indicates: P0420 Catalyst System Efficiency below Threshold(Bank1)

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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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Need to know whatDTC's P0420 and P0432 mean for my 2002/3 Jeep Grand Cherokee Laredo 4.7 ltr V8 Thanks Colin


420 is catalist below threshold bank one.
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1 Answer

Check Engine Light ON


What codes come on? P0420

The converter's only purpose is to reduce emissions from the engine, in rare cases the converter can disintegrate which could result in a loss of power but this is not very common,

This means that you're Cat needs repair or replacement, You're car will not pass legally smoged without fixing this. :

Good luck

Sep 04, 2009 | 2000 Jaguar S-Type

1 Answer

Codes p0303/p0420/p0700 what mean that


P0420 Catalyst system below Efficiency Threshold (Bank1)
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p0700 Transmission Control System Malfunction

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