Question about 1999 Acura TL

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PO420" Catalyst efficiency low Bank 1"

I have a 2000 Acura TL and my check engine light is on. I got a code reader and got this code ("PO420" Catalyst efficiency low Bank 1"). what does that mean and how can I solve the issue. does anyone know?

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  • Anonymous Mar 19, 2014

    bank 1 low

  • Anonymous Mar 30, 2014

    CHECK ENGINE LIGHT ON. AUTO ZONE COMPUTER CHECK PO420 CATALYST EFFICIENCY LOW - BANK 1

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Replace the catalytic converter.

Posted on Mar 10, 2009

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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).

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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

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


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P0420 code is((catalyst efficiency below threshold on bank 1)
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2001 santafe with error cod PO420


CODE PO420 - CATALYST EFFICIENCY BELOW THRESHOLD BANK 1. POSSIBLE CAUSES, AIR LEAKS AT THE EXHAUST MANIFOLD OR IN THE EXHAUST PIPES, BASE ENGINE PROBLEM HIGH ENGINE OIL OR COOLANT USAGE, CATALYTIC CONVERTER IS DAMAGED CONTAMINATED OR HAS FAILED, CONTINUOS ENGINE MISFIRE CONDITIONS OR WEAK LOW COIL OUT PUT, FRONT HO2S OR REAR HO2S IS CONTAMINATED WITH FUEL OR MOISTURE, REAR HO2S IS LOOSE IN THE MOUNTING HOLE CHECK IT FOR A LEAK.

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The PO420 means that the Catalyst System has an Issue'

The actual error is

"Catalyst system below Threshold (bank 1)"

As mentioned above, the code's description is Catalyst System Efficiency Below Threshold (Bank 1). OK, now tell me that again in plain English please.... let's break it down: the catalyst system being referred to is your three-way catalytic converter; so the catalytic converter is not working properly (i.e. it's not efficient). Bank 1 refers to the side of the engine which contains cylinder #1. On inline engines such as 4 & 5 cylinder engines, there is only one bank. So, to really simply things let's just say that the efficiency of the catalytic converter and/or exhaust pipe and/or O2 sensor is not so great.

There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

You can search for the Information on the web. Just type in the actual error above into you fav search engine!

Hope that helps...

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Code po573 is cruise control / brake switch circuit A circuit voltage high PO420 catalyst system below threshold, po573 is probably a bad brake circuit / switch problem, PO420 is a bad catalatic convertor for bank 1

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