Emissionguy is a professsional car mechanic who enjoys the outdoors, dogs, guns, riding, relaxing in the sun, and pool. Replacing a catalytic converter or "cat" has become a big, expensive drain on a lot of people's budgets these days. I want to share some information about what's happening here with emissions testing, and some ways to get emissions-compliant without shelling out piles of money.
So your car or truck is running well, but that "check engine" light is on, with a code P or P, and related "catalyst efficiency below threshold" codes. You like your car, so you take it to be looked at. Some mechanics will tell you that a converter never goes bad on its own: there is always something else wrong with the car.
There is a lot of truth to this. A converter reduces pollution through chemical reactions that require fuel from the unburnt gas in your exhaust streamheat from your exhaustand oxygen. If these inputs aren't in balance, the cat doesn't work well. When a car's engine is skipping, the overheating that results can destroy the catalytic converter.
When a car is running too cold from a long warm-up time, for example, let's say if the thermostat is bad, the same thing can happen: good-bye converter. Another way a converter can die is from poisoning due to the introduction of silicone into the exhaust. When a car engine has a head gasket leak, even a small one that doesn't make the car overheat, the silicone from the coolant can stop the converter from working.
Converters that have failed in these ways can often be brought back to life using a cleaning product called "cataclean. This actually works about half the time. Then you clear the engine light, drive two days, and go back to emissions for a retest.
But I'm not here to hawk overpriced cleaning chemicals. If you are going to spend the cash to replace a converter, consider replacing the thermostat at the same time, and putting a can of alumaseal in the radiator, so the new cat has a healthy lifespan.
Let's talk about how your car knows the converter is bad in the first place. The rear oxygen sensor the one behind the converter monitors how much oxygen is coming out of the converter at any time. A healthy converter will use a lot of oxygen, and so the rear oxygen sensor will see that there is little oxygen coming out of the back of the converter.
In this situation, the "check engine" light will not come on to indicate catalytic converter failure, because all is well.In simple terms, it means that more pollution is added into the air than what was supposed to be because of your car.
The P code is quite the common trouble code. In order for the car to be able to keep a reasonably low emission of carbon monoxide, hydrocarbons and oxides of nitrogen, a three-way catalytic converter is used by the engine control system.
Within the converter is the catalyst which promotes a chemical reaction that oxidizes the CO and HC within the exhaust gas. It is through this chemical reaction that HC and CO are converted into carbon dioxide and water vapor that is basically harmless.
Moreover, this reaction also effectively reduces the NOx and then converts it into Nitrogen. This process is monitored using Bank 2, which is located inside of the exhaust stream at the three-way catalytic converter.
Basically, the P code is a trouble code used to indicate that the sensor in the catalytic converter located in bank 2 has detected that the converter is not working properly.
This trouble code indicates that the converter is not working as efficiently as it should have been according to its specs. The common symptom that indicates this condition exists is when the PCM or Powertrain Control Module detected excessive Bank 2 activity than what was within its acceptable range over a period of time.
In other times, however, no abnormal symptoms can be noticed. Catalytic converters fail because of normal degradation, physical damage, overheating, contamination, substrate restriction or due to internal disintegration. In order to check if it is truly not working effectively according to the specifications and as it should have really been, you can try these tests in order to see if the converter is functioning well.
On the other hand, when you are looking for internal disintegration, you can check by using a rubber mallet to lightly rap the converter. If it rattles, it would mean that the wrap that insulates the substrate against the catalyst converter has become lose or perhaps the substrate itself has disintegrated. Remember me. Table of Contents. Subscribe to our mailing list.Visually inspect the related wiring harness and connectors.
Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. P Tech Notes As the code description implies the P code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly is not as efficient as the factory is expecting. Replacing the oxygen O2 sensors may sometimes fix the code, but in most cases, the catalytic convert needs to be replaced to fix the problem.
If the P code is combined with other codes, try fixing the other codes first. What does this mean? Cost of diagnosing the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city. When is the P code detected? A three way catalyst converter Manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed. P More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals. Related Information. Repair Importance Level: 2. Why is the Engine Light ON?OBD2 Code P Lexus definition: 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. Causes Possible causes of OBD code P Lexus A code P Lexus 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.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. Many manufacturers give a five year, unlimited mileage warranty on these items. The list of automotive Makes at the right edge of the screen. The currently selected ODB-ii codes is for the Lexus makes. Enter the 5 character trouble codes in the search box and submit the search.
If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes. The information contained on this site is presented for informational purposes only.
Error Code P0430: Catalyst System Efficiency Below Threshold (Bank 2)
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Save my name, email, and website in this browser for the next time I comment. Search for: Search. What does this mean? Causes Possible causes of OBD code P Lexus A code P Lexus 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. Note: 1. Leave a Reply Cancel reply Your email address will not be published.The design of the exhaust is such that the heat shields around the center section of the y-pipe hold moisture and road salt to the pipe, accelerating corrosion. More on the check engine light in a moment.
And zoomed in more on the passenger side of the pipe the right side in the above :. And a closeup of the leak location and corrosion the heat shield has been bent back to better show the amount of corrosion :.
The leak in the above photo is indicated by the arrow, the other lines to indicate how the pipe has corroded underneath the heat shield. The vehicle has four oxygen sensors, two for each bank that serve different purposes. The vehicle then compares this data to the other oxygen sensor on the same bank, ie. This indicates the catalytic converter is catalyzing the exhaust mixture of oxygen, H2O waterCarbon Dioxide, Carbon Monoxide, Nitrous Oxides smogand hydrocarbons unburned fuel into the cleanest emissions possible mostly Carbon Dioxide and Water.
It is important to note that only oxygen content of the exhaust is being checked by both sensors, but this alone is enough to confirm the health of the catalyst.
Lexus has updated the y-pipe assembly to address this concern, changing the design of the heat shields and pipe to prevent the pipe having this same issue again. We strongly encourage guests install the update part vs.
We also strongly encourage guests to fix the issue as soon as the exhaust gets louder than normal — when the pipe breaks off entirely the vehicle is extremely loud. Call Us Today! Facebook Facebook. Previous Next. GS exhaust leak. GS exhaust closeup.
P0430 - Catalyst System Efficiency Below Threshold Bank 2
If you own an IS or GS, CARspec would like to perform the intake valve cleaning procedure on your vehicle at significantly reduced About the Author: John Cleveland.
After years of experience working for the dealerships, owner John Cleveland set out to start a new kind of shop for Toyota, Lexus and Scion owners unlike any in Minnesota — one that offers a competitive price point, technical prowess, honesty and environmentally friendly practices.
Article Categories. Recent Posts. Find us on Facebook. Recent Tweets.By boblexusSeptember 21, in 01 - 06 Lexus LS With a little investigation I found that. This shield is to. Well I said to myself, how did this happen. After further investigation I discovered the lexus cheaped out. The clamps had rusted and. Well this was interesting.
P0430 Engine Trouble Code
The part also includes the four forward. So save yourself a lot of money and order the aftermarket part and rest in peace.
I could hear the exhaust leak by putting my car on a ramp. Starting the car while under it at which point. I have been struggling with this one myself.
I have same pin hole leaks on the Y pipe just under shield. I think electrolysis from dissimilar metals shield is stainless steel pipe is steel. Poor design. Even entry level Chryslers have stainless steel exhaust pipe. Not sure why Lexus cheaped out here. I think the shields exist to retain heat in the pipe. This way the secondary catalytic converter gets up to temperature known as the "light off" temperature and functions properly.
Only and earlier. Since they tacked on the secondary Catalytic Converter to it the pipe is pricier than it needed to be.When your car's 'Lexus IS P Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off. When you check Lexus IS car engine light came on code P the reason should be Three way catalytic converter Bank 1 does not operate properly. So you should chech it on our car models. Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use.
You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. Parts or components should not be replaced with reference to only a P DTC.
The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing. Code Search Please fill the "Code Box" to find engine fault code. Ways to read engine trouble codes.
Ways to clear check engine light on car panel. Check Engine Light Dictionary Ways to clear check engine light on car panel. Main engine trouble code archive on Web. Copyright EngineTroubleCode. Check engine light comes on Engine stalling or misfiring Engine performance issues Car not starting. If one of these reasons for P code is occuring now you should check P repair processes.
Now don't ask yourself; What should you do with P code? The solution is here :.