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Catalyst system effiency below threshold - Cars & Trucks

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Needs new converter. at some point it sounds like you have had a rich running condition. that causes the converters to get contaminated and not function properly

Posted on Jan 09, 2013

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  • Maynard Thomas Jan 10, 2013

    Thank you for the information ...looks like that is my next step ...can one be ordered from the internet at an affordable price ..?

  • kenneth white Jan 10, 2013

    try your local exhaust shop. shop around first.

  • Maynard Thomas Jan 10, 2013

    Thank you Kenneth ..you've been very helpful ...

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Posted on Jan 02, 2017

ghost4548
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SOURCE: 2002 Hyundai Sonata code reads P0430 what does this mean Catalyst System Efficiency Below Threshold (Bank 2)

That's a pretty RELIABLE code!... You have a bad CAT (Catalytic Converter). Trust it to be accurate. The conditions which set this code is when the Upstream O2 sensor's data/signal is compared to the Downstream sensor's data/signal... when they are nearly identical, that's when this code is set (unless you have an exhaust leak).. If there is an exhaust leak.. repair it, then retest/recheck.

Posted on May 31, 2009

polarcycle
  • 1392 Answers

SOURCE: Catalyst System Efficiency below threshold.

Need to replace your cat converter. You can do it if you are mechanically inclined. But, most likely will need to be taken to someone with a lift. Yes it will be expensive. Look at $500-1000.

Posted on Mar 16, 2009

SOURCE: PO420 Catalyst System Efficiency below threshold.

Basically the mechanic will make sure don't need a tune up. or have vacuum issues or leakes in the exhaust before the cat. Then he should check the front 02 sensor to make sure its not getting lazy. If all this passes then you will need a new cat. If the O2 sensor has more than 70,000 miles on it it needs to be replaced anyways so you may just want to do this first and hope the light stays off.. The problem with a lean code is you will wear out the cat real fast if you didnt deal with this and kept driving the car. The lean code could have been vacuum leak or a bad MAF sensor or weak fuel pump.

Posted on Sep 02, 2009

  • 234 Answers

SOURCE: catalyst efficency below threshold

The code Im assuming is po420, or po430. In either case it means the catalytic converter is inert and no longer has the ability to convert hydrocarbons to CO.

Posted on Oct 18, 2009

NismoMaster
  • 146 Answers

SOURCE: scan tool read codes p0303 and p0420

DO NOT ERASE THE CODES. There is Freeze Frame data that the technician may need to print off and attach to the Repair Order if it is covered under a CAMPAIGN. The misfire code P0303 relates to cylinder three not contributing. It could be a spark plug, ignition coil or an injector. I would check these items first before taking it to a dealer. There is also a campaign (RECALL) for the Power Valve (NTB05-058b) where the screws may have become loose. This is located inside the intake manifold.

The P0420 code could be a defective catalyst. The parameters for the catatytic converter may need to be widen through the ECM reprogram. It could also be one of the following bulletins or campaigns (RECALL): NTB09-046, NTB06-004b or CAMPAIGN NTB03-070b (R3007, R3014, R3015, R3016 & R3017). You will need to take the vehicle to a NISSAN dealer to verify if your vehicle is affected by these. Simply ask the service writer to check if your vehicle has any open campaigns. This is free. The bulletins may cost you.

Posted on Dec 20, 2009

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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...
    Feedback

    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

Code p431 and p421


P421=Warm up catalyst system efficiency below threshold, bank 1
P431=Warm up catalyst system efficiency below threshold, bank 2
Sounds like you may have clogged or damaged catalyst converters or bad 02 sensors.
Those codes I think are taking from after the catalyst by the sensors in the exhaust pipes. Be careful taking it to a mechanic for further checking since the catalyst converters are not cheap through them. If you need to replace the converters, shop around and get prices on aftermarket parts. Don't be ripped off by a hungry mechanic or especially a dealer.

Aug 17, 2013 | 2006 Mitsubishi Eclipse

1 Answer

Where should i find this sensor P0342?


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up (masking the original reason for converter failure).

Nov 04, 2012 | Chevrolet Epica Cars & Trucks

1 Answer

What does a po430 code mean on a mercury cougar


EXHAUST RELATED ERROR CODES

There are 711 possible PO generic DTC error codes. Only 7 of the 711 codes are exhaust related.

PO401: Insufficient EGR Flow

PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected

PO410: Secondary Air Injection System Malfunction

PO420: Catalyst System Efficiency Below Threshold (Bank 1)

PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)

PO430: Catalyst System Efficiency Below Threshold (Bank 2)

PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)

THINGS TO ASK YOURSELF OR YOUR CUSTOMER

Have there been any driveability or performance issues with the vehicle, have there been any recent repairs or tune-up work performed, if so was the check engine light reset and were the codes recorded on previous repair orders.

Do not rely on scan tool data alone. In most applications, the customer will have the check engine light reset prior to repair. If the original cause of converter failure is intermittent, only the catalyst failure code may show up

Nov 04, 2012 | Cars & Trucks

1 Answer

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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Sep 17, 2012 | 1996 Ford Taurus

2 Answers

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.
432 is catalist below threshold bank two.

Oct 20, 2009 | 2002 Jeep Grand Cherokee

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