Question about 2006 Chevrolet Aveo

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My 2006 chevy aveo displaying check engine light. error code is po 420 "catalyst system efficiency is below threshhold". i took it to my local mechanic and he changed the electric coil wiring. but code came back. I took my car to chevorelet agency. my warranty is over but converter warranty is still good. but agency says that they detect the po 420 code and they have to change my all fuel injectors and then they might be flashing the obd computer or replacing it only then they can change catalytic converter. altogether with labor it costs $1300-$1400. When i asked them if they are sure fuel injectors are bad as my car mileage is only 46000 they said how they can know unless they open my engine and if i agree for repairs then they will replace fuel injectors. Please guide?

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Oh My God. Talk to an honest mechanic! You probably have a bad oxygen sensor. It will cost you about $45 dollars for a new one. You can change it yourself. It is the oxygen sensor that is located just to the rear of the catalytic converter. replace it and have the codes cleared at an auto parts store. If the code comes back, then you may need to replace the oxygen sensor that is on the engine exhaust. An auto parts store can look at the voltage of each oxygen sensor and tell you which one is bad. Each oxygen sensor should be bouncing around on the voltage and should frequently be at around .7 volts. If one of them is at .1 or .2 volts, that is the bad one. Buy that one and replace it. Very simple. DO NOT DO THE $1400 repair. That repair shop is trying to take you. Hope this helps.

Posted on Mar 19, 2017

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Posted on Jan 02, 2017

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SOURCE: Chevy Blazer P0303 and P0420

Most probably and if a cat is not flowing proper is causes back preasure that can result in sticking or burned vavles,mechanic not nice by saying ignore the cat effiency code p0420.Can ussually have cat replaced at aftermarket muffler shop for approx. $200 cheaper than valve job or excessive fuel that you have used and damage that may occur to your engine.

Posted on Jun 16, 2009

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SOURCE: have a code po 430 catalyst efficiency below

You def have a catayst problem. Before changing the converter i would recommend changing both up and down stream oxygen sensor on bank 2. If they are old thats what the computer determines if the catalyst is good or not. Most of the time after changing the sensors and resetting the light the problem is solved.

Posted on Aug 26, 2009

johnjohn2
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SOURCE: catalyst system efficiency below threshhold bank 2

before replacing cat converter replace o2 sensors, they go bad and give a false reading that cat efficiency is below threshold ,meaning converter is no good , i would replace o2 sensors and reset engine light and go from there,the o2 s are normaly the problem, unless you hear cat rattling, well good luck,

Posted on Oct 26, 2009

  • 97 Answers

SOURCE: 420 code catalyst system efficiency below

You could have an enefficient converter. Question is what caused it to go bad? I have attended seminars on code 420, Possible causes are lack of spark or clogged fuel injectors. there have been times where the spark plug wire lays on the engine and over time it wears a weak spot in the side of the wire, its not enough to throw a miss fire code but it keeps the full amount of spark from getting to the plug and not burning the all the fuel in the cyl. A leaky injector would also cause to much fuel to be deliverd into the cyl and not get burned.

Hope this helps.

Posted on Jan 20, 2010

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SOURCE: catalyst efficiency bank 1 below threshold

before doing anything make sure you have to code for your radio if you have the antilock radio feature!
disconnect the battery wait a few moments I can only give this info for a quick fix this will reset the computer and if it was just a glitch it should be fine after this should it reacour it is a oxygen sensor

Posted on Mar 04, 2010

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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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How to fix the problem related to engine light on code PO 420 of Toyota corolla 2000, Engine 1.8L - golden03


Code PO 420 is telling you that the Catalyst System Efficiency Below Threshold (Bank 1), so the Cat converter inst working as it should according the the vehicles computer. This can be caused from the converter going bad from age and use. Or it can also mean you have a failing rear oxygen sensor, because this sensor is instrumental in keeping track of what the converter is doing. If the car is driven on several short trips, and hardly ever driven on the highway, you may be able to burn the deposits out of the converter and restore its function. To do this you should drive it on the highway for at least two hours. After this have the light reset. If the code comes back then have the converter and oxygen sensor tested. Most shops will simply want to replace them and see if it fixes the problem. Don't fall for this, because it is expensive, and you don't need them changed unless they are bad. Get the converter tested and the oxygen sensor tested prior to replacement. The problem could be as simple as a bad electrical connection on the oxygen sensor, that is why I say have them tested.

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P0420 Catalyst efficiency below range.

P0731 A/T Additional Gear Ratio Error In First Gear

Your catalytic converter could be clogged up or just bad. Or, you could have a leak before the catalyst.
The other code suggest you have an internal transmission problem that is mechanical and cannot be fixed without taking the transmission apart.

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code 420= Catalyst system efficiency below threshold(bank 1) code 496=Evaporative emission system-high purge flow. Hope this helps if you need more help get back to me Thanks Ray

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