Question about 1997 Mercury Grand Marquis

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P0430 code and both converters have already been changed with aftermarket converters

I had my car inspected and it didn't pass emissions due to catalyst efficiency low in bank 1&2; however at autozone it only said in bank 2. The mechanic told me I would have to replace both catalytic converters, but that there were already aftermarket converters on there. I don't see how they could already need replaced again. Is there anything else that could be causing this reading? Also, in my online search for a reason, I saw that after market converters could cause this reading. I do not have the money to change 2 converters, especially if it's not needed. Any suggestions?

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  • Mercury Master
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There are different cat converters on the market but I would investigate the possibility of the HO 2sensors not being compatible with the converters thereby giving the CPU an incorrect reading It is not a matter of faulty as so far as in efficient because they do not have the correct size medium inside to burn all the emissions fully

Posted on Apr 28, 2013

Testimonial: "I had suspected that it may just be the sensors so I will have them checked and changed to be compatible with the converters on my car now. Thank you so much...I will update with the conclusion once I get that done."

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Posted on Jan 02, 2017

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ZJLimited
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SOURCE: I have a 2004 sable.

When you detected one code P0174 - System Too Lean (Bank 2), this basically means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

Causes: A code P0174 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
There could be a vacuum leak downstream of the MAF sensor.

Possible solutions include:
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure

zjlimited_472.gif

Bank 2/Sensor 2 is at the bottom of the engine as you look in from the bumper. It is installed in the exhaust pipe just below the catalytic converter. The Bank 1/Sensor 2 is at the same location on the back of the engine below the firewall.

P0430 means Catalyst System Efficiency Below Threshold (Bank 2) basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0430 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

Possible Solutions: First, inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Hope this helps.

Posted on Jul 03, 2011

emissionwiz
  • 76846 Answers

SOURCE: 1997 Mercury Mountaineer What is Catalyst Efficiency Below (Bank

it means the catalyst is worn out, the efficiency is monitored by sensors, when the Cat falls below a certain reading or "threshold" the code is generating telling u that u need a new catalytic converter.

Posted on Feb 18, 2010

kapishtech
  • 2272 Answers

SOURCE: recently had my smog done check engine light w 3

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.
P0174 OBD-II Trouble Code Technical Description

System Too Lean (Bank 2)
What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

-----------

P0430 means you're going to buy a cat. (And you'll have to fix the coolant leak.)Catalyst System Low Efficiency (Bank 2) .Also check O2 sensors .

Thanks.

Posted on Oct 01, 2010

  • 1 Answer

SOURCE: replacing my bank 2 catalytic converter - 2000 mercury cougar

what does code P0430 cat bank 2 mean? how many cat. converters does my car have? which one do i need? on my 2000 Mercury Cougar 2.5 liter auto trans.

Posted on Mar 30, 2011

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Trouble code P0430 2006 Chrysler Sebring


Hi,


code: Catalyst System Efficiency Below Threshold (Bank 2)
Causes

A code P0430 may mean that one or more of the following has happened:

  • The catalytic converter is no longer functioning properly
  • An oxygen sensor is not reading (functioning) properly
  • There is an exhaust leak
Possible Solutions

First, inspect for exhaust leaks.

Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensoricon1.png while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileageicon1.png warranty on these items. It's worth checking into.


Td

Nov 06, 2012 | 2006 Chrysler Sebring

Tip

I get OBD codes P0420 and P0430



P0420 and P0430

P0420 means Catalyst System Efficiency Below Threshold, Bank 1

P0430 means Catalyst System Efficiency Below Threshold, Bank 2

It means that the O2 sensors are good, and the O2 sensors are telling you that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

on May 27, 2009 | 2003 Chrysler 300M

1 Answer

Truck is showing code p0430 its a 1998 ford explorer


Nice SUV, I have one '97 XLT... well P0430 - Catalyst System Efficiency Below Threshold (Bank 2) means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

A code P0430 may mean that one or more of the following has happened:
- The catalytic converter is no longer functioning properly
- An oxygen sensor is not reading (functioning) properly
- There is an exhaust leak

About the possible solutions, first, inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Hope this helps; if need additional details, fell free to contac us. Good luck.

Oct 05, 2011 | 1998 Ford Explorer

1 Answer

P0420 and p0430 faults no others comes back 20 miles of driving?


this obd2 trouble code table can help you understand the meaning of code.
and for the p0420, you can try :

Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.

Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).

Inspect the downstream heated oxygen sensor (HO2), replace if necessary

Replace the catalytic converter

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

for p0430, try:

.

First, inspect for exhaust leaks.

Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen o2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Aug 17, 2011 | Toyota Tacoma Cars & Trucks

1 Answer

I have a 1997 Ford F-150. It didn't pass emissions. The Codes that came up are as follows, P1506,P0171,P0430,P0174. And comments, P0430Catalyst System Efficiency Below Threshold( Bank 2 ), and...


The p1506 is the Idle speed control Solenoid making the engine overspeed at idle. This is a small air regulating solenoid which fits into a shallow well on the intake manifold. Take it out and clean with WD40 and then try it, it is probably gummed up.

The p430 can be a worn out catalytic converter. The can be purchased new in the aftermarket or bought used at a Salvage yard. Car-parts.com will be a good place to try. Or go new with an aftermarket unit.

The 0171 and 0174 are lean codes. Check your intake manifold for leaks or when you fix the Air control solenoid I mentioned, these problems may go away. If not use a water mist around the engine seams when the engine is running to pinpoint leaks. The rpm will change.

The price of the catalytics has come down, and used parts will work too. Hope my solutions get you going for less than the price quotes.

Jun 01, 2011 | Ford F-150 Cars & Trucks

1 Answer

On my car i got a code of po430


P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0430 may mean that one or more of the following has happened:
The catalytic converter is no longer functioning properly
An oxygen sensor is not reading (functioning) properly
There is an exhaust leak

Possible Solutions: First, inspect for exhaust leaks.
Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Keep us updated.

Apr 26, 2011 | 2004 Cadillac CTS

1 Answer

HI I have light service engine soon I conect a code reader P0430 catalytic converter sistem efficincy below threshold (back2)


The catalytic converter is not working as well as it should be, this code will not affect they way the truck runs, just means it is polluting more than it should be. Converters are covered under a 8 yr 80,000 mile federal emissions warranty, if you have less than 80,000 miles, contact yoru dealer and they should replace them under warranty. Otherwise, you can replace it with an aftermarket one for less money, but most likely the code will return, due to the aftermarket ones usually not being as good as the factory ones.

Oct 19, 2010 | 2005 Nissan Frontier

1 Answer

Ck. Engine P0420 & P0430


engine code p0430 for 2005 toyota sienna

Nov 25, 2009 | Toyota RAV4 Cars & Trucks

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