Question about 1997 Toyota Tacoma

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2001 TACOMA, 2.7 ENG., 4WD, REG. CAB, STNDRD. CHECK ENG LIGHT CAME ON AND READ; CATALYST BELOW EFFICIENCY LEVELS, BANK 1. REPLACED THE CONVERTER WITH AN OE STYLE AFTERMARKET. LIGHT CAME BACK ON THE NEXT DAY. THEN REPLACED DOWNSTREAM SENSOR WITH AFTERMARKET TYPE. LIGHT CAME BACK ON IN 6 DAYS. THEN REPLACED UPSTEAM SENSOR. LIGHT CAME BACK ON IN 3 DAYS. A MECHANIC FRIEND TOLD ME THAT THE COMPUTER PROBABLY WASN'T RECOGNIZING THE AFTERMARKET SENSORS. BOUGHT DOWNSREAM SENSOR FROM DEALER [VIN MATCHED] AND INSTALLED. LIGHT CAME BACK ON IN 6 DAYS. BOUGHT UPSTEAM SENSOR FROM DEALER [VIN MATCHED] AND INSTALLED. LIGHT IS BACK ON NOW AFTER 9 DAYS. TRUCK IS DRIVEN DAILY [40 MI] WHAT TO DO NOW? THESE SENSORS ARE EXPENSIVE AND NOT RETURNABLE. NEED EXPERT ADVICE.

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  • rmcjlc Jul 20, 2009

    the solution to my originally posted problem was that the o.e. style aftermarket cat i installed is the culprit, setting off the check engine light. I need a little more concrete proof of that, if it is really true, before I sink a ton of money in a new mfr. replacement converter.

  • rmcjlc Jul 21, 2009

    IN REFERENCE TO MY ORIGINAL POSTED PROBLEM CONCERNING 2001 TACOMA. REPLACED THESE.... AFTERMARKET O.E. STYLE CONVERTER. THEN, DOWNSTREAM SENSOR MFR. O.E.M. THEN UPSTREAM SENSOR MFR. O.E.M. EACH AND EVERY TIME THE ENGINE LIGHT WOULD COME BACK ONIN A FEW DAYS READING THE SAME CODE ALL THE TIME. CATALYST EFFICIENCY BELOW LEVELS, BANK 1. LIGHT WAS ERASED EVERY TIME WITH THE DIAGNOSTIC DEVICE AFTER REPLACING PART. 1ST EXPERT SAID THE AFTERMARKET CAT WAS MY PROBLEM. SECOND EXPERT SAID MAY BE FAULTY COMPUTER. NEED SOUND ADVICE ON HOW I MAY DIAGNOSE THIS PROBLEM TO BE FAIRLY SURE OF THE FIX BEFORE I SPEND A LOT MORE MONEY NEEDLESSLY.

  • rmcjlc Jul 21, 2009

    IN REFERENCE TO MY ORIGINAL POSTED PROBLEM CONCERNING 2001 TACOMA. REPLACED THESE.... AFTERMARKET O.E. STYLE CONVERTER. THEN, DOWNSTREAM SENSOR MFR. O.E.M. THEN UPSTREAM SENSOR MFR. O.E.M. EACH AND EVERY TIME THE ENGINE LIGHT WOULD COME BACK ONIN A FEW DAYS READING THE SAME CODE ALL THE TIME. CATALYST EFFICIENCY BELOW LEVELS, BANK 1. LIGHT WAS ERASED EVERY TIME WITH THE DIAGNOSTIC DEVICE AFTER REPLACING PART. 1ST EXPERT SAID THE AFTERMARKET CAT WAS MY PROBLEM. SECOND EXPERT SAID MAY BE FAULTY COMPUTER. NEED SOUND ADVICE ON HOW I MAY DIAGNOSE THIS PROBLEM TO BE FAIRLY SURE OF THE FIX BEFORE I SPEND A LOT MORE MONEY NEEDLESSLY.

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I know you have heard this before already but the converter that you had installed is your problem you need the oe one from the dealer.O2 do not fix this code i know because this is what i do and have in the past been burnt by not putting in the correct converter thinking the o2 will fix it when the 2 cars came back but no more getting bit.:)

Posted on Jul 21, 2009

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Could be faulty computer. What engine codes have you gotten after you replaced the parts and reset computer?

Posted on Jul 20, 2009

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I would definatly suspect the Cat. Insufficient cat function will throw that code everytime. Its a normal sensor seeing cat efficiency drop off.

Posted on Aug 24, 2009

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I can tell u from past experience that the problem is the aftermarket catalytic converter, they set the light of every time, not sure what about the aftermarket cat doesn't do the job of cleaning the exhaust, but there is a reason why the OEM part costs so much and the aftermarket is $100's cheaper, u may reject this solution but in the end u will use factory cats to cure this problem.

Posted on Jul 14, 2009

  • yadayada
    yadayada Jul 20, 2009

    concrete proof is the 30 or 40 cars that using an aftermarket cat's on caused the cat monitor to trigger a code (catalyst efficiency below limits), I have been doing this 40 years and don't give out expensive advice like this based on zip to back me up, so my answer is field testing of real cars with your problem.

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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

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

2 Answers

Hi, I need to take my 2001 Mazda 626 4cyln for SMOG check in CA. But its check engine light is on, diagnosed as code P0421. Appreciate your help to fix this problem, or just to pass the check. Thank you.


CODE P0421. DEFINITION-CATALYST EFFICIENCY LOW-BANK 1. EXPLANATION-THE OXYGEN SENSORS MONITOR THE CATALYTIC CONVERTERS ABILITY TO STORE OXYGEN. PROBLEM CAUSES- 1. CATALYTIC CONVERTER DEFECTIVE (FAILURE POSSIBLY DUE TO #2,3, OR 4) 2. ENGINE MISFIRE OR RUNNING CONDITION. 3. LARGE VACCUM LEAK 4. ENGINE OIL LEAKAGE INTO EXHAUST-VALVE GUIDE SEALS, PISTON RINGS. THE PCM HAS DETERMINED THAT THE WARM UP CATALYST EFFICIENCY FOR BANK 1 IS BELOW TRESHOLD FOR THE CURRENT ENGINE OPERATING CONDITION. (BANK 1 IDENTIFIES THE LOCATION OF CYLINDER #1, WHILE BANK 2 IDENTIFIES THE CYLINDERS ON THE OPPOSITE BANK).

replace O2 sensors, or your Catalytic Converter.

Oct 06, 2010 | Mazda 626 Cars & Trucks

1 Answer

My check engine light came on with P0422 and P0455 codes. Any suggestions as to the cause.


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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Aug 04, 2010 | 2008 Saturn VUE

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

2 Answers

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



Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.$%@#

Jan 24, 2010 | 2001 Kia Sephia

2 Answers

Changed both o2 sensors and front catalytic converter 2001 v6 tacoma 4wd dbl cab check engine light came back on initial scanner diagnosis catalytic efficiency bank 1 any ideas? could it be back converter


if the converter was bad the engine would loose power . alot of times the check engine light will come on for the emmitions check youre gas cap some vehicles will send a signal to the computer if the co is not right and by changing the gas cap solved the problem .

Nov 14, 2009 | 2001 Toyota Tacoma

1 Answer

1999 beetle P0422 which O2 is bad the o2 before the cat or after


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



Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

Jan 27, 2009 | 1999 Volkswagen Beetle

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