Question about 2001 Jaguar S-Type

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On a Jaguar 2001 S Type I have a code 420 and 430 which indicates low efficiency threshold on the catalytic converter. What can I do to increase the efficiency?

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You would have to replace the catylitic converter(s) if efficiency is low. In some cases the rear o2 sensors become lazy and can set these codes. You can replace these sensors and see if the codes will go away. In most cases, when converter replacement is required, these sensors are recommended. I would change the rear o2 sensor(s) and hope for the best. Converters are very expensive

Posted on May 01, 2015

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Posted on Jan 02, 2017

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The P0430 is a catalytic convert Efficiency Below Threshold Bank 2 .You have multiple misfire codes , You melted the catalytic converter . You need to take it to a ASE certified repair shop .

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well I feel bad for you now. P0340 is bank 2 catalytic converter efficiency below threshold.
Road test the vehicle and bring it back into the shop, raise on lift while running, (don't shut it off) and use a temperature scan probe to check the temperature differential between the inlet and outlet of the catalytic converters, it must be at least 100 F difference inlet to outlet. If not, the catalyst is not functioning. replace it then.

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2001 Audi A6
EOBD code: P0420
Fault location: Catalytic converter system, bank 1 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

EOBD code: P0430
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Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

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Need to pass emissions test, dianostic test - Catalyst efficiency blow threshold (bank 1) tried to order part - now I need to know if it pre or post, left or right Oxygen sensor, can it be determined by...


Yes it can be determined by the DTC (Data Trouble code). If the DTC is P0420 (catalyst system efficiency below threshold Bank-1) then the side of the engine with the #1 spark plug and cylinder is always Bank-1, and the O2 sensor that monitors the catalyst efficiency is usually after or (post) of the catalytic converter.

The #1 cylinder is located at the front spark plug on the right or the passenger side of the vehicle, so Bank-1 is on the right side of the vehicle, and the O2 sensor that monitors the catalyst efficiency should be located after or (post) of the catalytic converter. It would be the post right O2 sensor.

There is also the possibility that the catalytic converter is actually starting to fail, and if changing the O2 sensor and clearing the DTC does not solve the problem them the catalytic converter is most likely faulty.

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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.

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PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

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What are codes P1492, P0421 & P0431 on the 2002 Mazda Millenia?


po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..

Feb 08, 2010 | 2002 Mazda Millenia

1 Answer

The only fault code on 2001 kia sephia is P0422, catylist threshold low.... car ran for 2 weeks fine after new fuel pump, and then just died like first time.... 126 thousnd miles and plenty of fuel, fuel...


P0422 - Catalyst below threshold.

Catalytic converter is clogged or out of medium.

Replace it.


ACTUAL DIAGNOSTIC:

Fault Code Definition
Code P0422 indicates that the Bank 1 Main Catalytic Converter's emissions efficiency has fallen below the minimum allowable limit. This threshold is tracked by a Catalyst Monitoring Oxygen Sensor located on or near the outlet of the Catalytic Converter.

Symptoms

* Check Engine Light will illuminate
* In many cases, no abnormal symptoms may be noticed

Common Problems That Trigger the P0422 Code

* Defective Catalytic Converter
* Engine misfires have damaged the Catalytic Converter
* Internal engine damage resulting in high oil consumption and/or a leaking Head gasket has damaged the Catalytic Converter

Common Misdiagnoses

* Oxygen Sensors are replaced when the real problem is a damaged Catalyst
* Catalyst is replaced when the real problem is internal engine damage, which is producing elevated emissions levels
* Catalyst is replaced when a misfiring engine is the real problem



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1 Answer

I have a 2001 Jaguar S Type 3.0l that had a P0430 engine code and runs rough at idle when stopped and in gear. Replaced the fuel filter and catalytic converter on the passenger side but vehicle still runs...


PO430 = Catalyst System Efficiency Below Threshold (Bank 2) You may still have a sensor fault in the combustion/injection system, You need to get this checked at a garage with the correct monitoring system for while the engine is running. Or take a gamble and change sensors. Hope this helps - good luck.

Dec 12, 2009 | 2002 Jaguar S-Type

1 Answer

Diagnostic trouble codes from smog test


Your best bet take it to a qualified repair shop that can do the diagnostics for the codes, no code tells you to replace a sensor . Viewing scan data on a professional scan tool an doing diagnostics
CatalystSystem Efficiency Below Threshold(bank2) ! This means you need to have a catalytic converter replaced .
080 EGR and Catalytic Converter Tests EGR Test

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