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EOBD FACILE android app, free version, will show the temps (see attachment). Maybe it can help if the sensors are reading correctly and/or where is the fault.
EOBD FACILE android app, free version, will show the temps (see attachment). Maybe it can help if the sensors are reading correctly and/or where is the fault.
I tried the torque pro and EOBD FACILE, I found that the O2 sensors are working properly.
(see attachment)
When the engine is running at Normal operating temperature, the O2 sensors give around 527 C for the four sensors.
Did you check for exhaust leaks? VERY common reason for the P0420 on this car is that catalyst takes too long to light off due to exhaust leaks, especially near the Y-pipe. Remember that the efficiency diagnostic runs just as the engine hits operating temperature after warmup, and if the catalyst hasn't lit off yet, you'll get the P0420/P0430 code.
I found a few videos, including Scotty Kilmer, suggesting to use one gallon of paint automotivr thinner to the fuel tank. All reported the same code as yours, and as long as the cat was not rattling, most times got rid of the code. Some report they do this to "help" pass emissions.
*NOTE, the above information use at your own discretion. I have never done this, but seems to give good results to those who have done so.
How old is the car, miles? the life of a CC is affected by how well the car has been maintained and they simply start to get "dirty" after many many yrs of use. Do check for leaks like other suggest.
Almost forgot to mention, on my 4Runner it triggers the code on certain gas stations in the area (in other words cheap lower grade gasoline). Just sayin, put some 93 Shell etc, clear the code and see if it comes back. One of my friends has a BMW, and that car will tell you quick which stations have lower grade fuel, he sticks w Shell and nothing else. I have found Circle K 93oct where I live is good quality.
Last edited by GrizzlyMan; Apr 19, 2021 at 10:15 PM.
I found a few videos, including Scotty Kilmer, suggesting to use one gallon of paint automotivr thinner to the fuel tank. All reported the same code as yours, and as long as the cat was not rattling, most times got rid of the code. Some report they do this to "help" pass emissions.
*NOTE, the above information use at your own discretion. I have never done this, but seems to give good results to those who have done so.
How old is the car, miles? the life of a CC is affected by how well the car has been maintained and they simply start to get "dirty" after many many yrs of use. Do check for leaks like other suggest.
Almost forgot to mention, on my 4Runner it triggers the code on certain gas stations in the area (in other words cheap lower grade gasoline). Just sayin, put some 93 Shell etc, clear the code and see if it comes back. One of my friends has a BMW, and that car will tell you quick which stations have lower grade fuel, he sticks w Shell and nothing else. I have found Circle K 93oct where I live is good quality.
The OP lives in Muscat which is in the Gulf of Oman, they might not have 93. Although that is an oil producing state, they may have crappy gas for the population. That being said, with all the exotic cars there, they may also have extremely high Octane available as well
A poorly running engine is what destroys a catalytic converter. Running rich for long periods of time. Also including exhaust leaks. Anything that heats it up more than it can handle.
Since you have a scan tool. Check the fuel trims at idle, cruising.
If you check for exhaust leaks, and find none. Reset the codes, and the code sets instantly. The cat is toast.
I checked the exhaust system and there is no leak. I think the catalytic converter is clogged. Especially I notice poor engine performance. As you know, the lifespan of catalytic converter is only 10 years.
Also, before one month I heard a rattling noise two times coming from under my car, it just came for a few seconds and then disappeared. I ignored the noise because I thought it comes from the vehicle that was beside me.
I am thinking to remove the cats and cleaning them outside the vehicle by using DPF and Catalytic Converter Cleaning Machine.
See thr below O2 sensors voltage that I captured today once I’m using the cruise control system.
I think you are on the right track, although if it is rattling is more of a replacement than cleaning. The honeycomb internals are loose, no cleaning will help, maybe temporary. If there is loss of performsnce probably the honeycomb grid is tilted in line w the exhaust creating blockage.
If it burns/consumes oil and is never opened up and held at like 4K to say go up a long hill, the cats can plug with ash leaving limited flow through them. A Tell tale sign is whistle sound when opened up. That implies restriction.
Based on the temperatures and readings fluctuating, they appear to be working. Don't count them out yet. It could be the sensors getting sluggish.
What fuel treatment products are available over there?
If it burns/consumes oil and is never opened up and held at like 4K to say go up a long hill, the cats can plug with ash leaving limited flow through them. A Tell tale sign is whistle sound when opened up. That implies restriction.
Based on the temperatures and readings fluctuating, they appear to be working. Don't count them out yet. It could be the sensors getting sluggish.
What fuel treatment products are available over there?
my car does not consume oil. I will remove the cats and clean them to avoid any damage to my engine.
I always use 95 octane gas.
but I want to know how many cats does Lexus is have? 2 or 4?
Is that on the picture a catalytic converter? If yes, does it affect the ECU if I remove it? Because it’s located after O2 sensor.
CEL with P0420 code
