Lit check on Lexus

Having been diagnosing and repairing vehicles for over ten years, I consider Lexus vehicles to be the most reliable vehicles. Lexus breakdowns are extremely rare, but they do happen. These are the most common reasons Lexus owners come to me from my experience. You can also ask questions in the comments, I will try to answer.

• fuel tank ventilation errors
• errors P0420/P0430
• vvt system
• failure
• oxygen sensors
• lean mixture - P0171
• knock sensor
• catalyst
• the battery is running low

first of all, problems with the ventilation of the fuel tank, symptoms of “check and VSC on”, errors P044X. If your check is on and the errors indicate a leak in the fuel tank “fuel vapor leak”, first check how well the gas tank cap closes, close the cap for a couple of clicks, this is written correctly.

When opening the tank cap, there should be a hissing sound, which many take for a malfunction, in fact, the absence of hissing indicates a malfunction. After all, the tank is airtight, and in any case, the pressure in it cannot be atmospheric, it is always more or less, so when the gas tank cap is opened, a hissing sound occurs.

The engine control unit controls this pressure in the fuel tank using a pressure sensor, fuel vapors are collected in the adsorber and during engine operation, at the command of the control unit, through the EVAP valve, they are fed into the intake manifold and burns together with the fuel mixture. If you doubt the serviceability of the gas tank cap, replace it, if the check does not disappear, you should contact the diagnostics.

It is not worth delaying the repair, since a leaky fuel system is not good, as you yourself understand. Through the EVAP valve, they are fed into the intake manifold and burned along with the fuel mixture. If you doubt the serviceability of the gas tank cap, replace it, if the check does not disappear, you should contact the diagnostics. It is not worth delaying the repair, since a leaky fuel system is not good, as you yourself understand.

Through the EVAP valve, they are fed into the intake manifold and burned along with the fuel mixture. If you doubt the serviceability of the gas tank cap, replace it, if the check does not disappear, you should contact the diagnostics. It is not worth delaying the repair, since a leaky fuel system is not good, as you yourself understand.

*In this article, the diagnosis and repair of a Lexus RX330 with error P0442 is based on the example of diagnosing and repairing an error P0442 in a Lexus RX330

The second most common problem with older Lexus RX300/330s is the VVTi system. Symptoms: the check is on or flashing, P1349 errors, misfiring, engine knocking at idle. Usually treated by replacing the VVT ​​valve, but in some cases where valve replacement does not help, a more thorough diagnosis of the VVT ​​system with an engine tester and disassembly is necessary to fix the problem.

• example of VVT diagnostics using an engine tester
• misfires, errors P030X, there can be many reasons for misfiring, you can check the spark plugs and coils yourself. The check can flash when it fails. The fuel injectors may need to be checked and flushed.

*Here is the diagnostics and repair of Lexus RX330 with error P0300 and P0303, a check was displayed there, the car started, did not drive, etc., the Lexus RX330 check is flashing

• two codes Lexus P0302
• faulty spark plugs
• ignition coil test
• oxygen sensors sometimes fail, in this case simply replacing the sensors with new ones, flushing the sensors will not help, the failure of the oxygen sensors mainly leads to an increase in fuel consumption. The front sensors (before the catalysts) are broadband, I only change to the original. Also, errors P0136 / P0156 do not always indicate a malfunction of the sensors, sometimes these errors are man-made. In this video, herd farm tricks caused the rear oxygen sensors to fail.

• errors P0135/P0156
• oxygen sensor
• error P0171 - a lean mixture, it happens for various reasons, on the Lexus RX330 the reason is the wear of the damper shaft seal to change the geometry of the intake manifold, it is very easy to check, when the engine is idling, we spray the carburetor cleaner on the damper shaft, when leaking through the seal, the speed will change. Treatment is valve replacement. To replace it, it is necessary to remove the intake manifold, the air conditioning pipes do not allow the shock absorber to be removed instead. It may also be necessary to diagnose and repair the fuel system, check the fuel pressure, check the pressure reducing valve or flush the fuel injectors. Video fuel pressure.

• code P0171 lean mixture
• knock sensors, missing fourth gear is added here for combustion control and VSC, usually treated by replacing knock sensors. To replace, remove the intake manifold.
• catalytic converter, errors P0420/P0430, control is also activated, VSC. The catalyst fails on all machines, regardless of the brand, the correct treatment is replacement with a new one, but this is a very expensive option. We've installed electronic hacks that definitely work on Lexuses.

• electronic catalytic converter emulator
• what is a catalyst

On this Lexus LX470 make sure VSC, TRC are on.

Errors due to malfunction of both catalysts. To eliminate errors, install emulators of electronic catalysts p0420.net.

catalyst emulator in the online store catalyst emulator for Lexus RX330

*We fixed catalytic errors on this RX350 that fixed catalytic errors on the Lexus RX350

Of course, these are far from all the possible causes of a burnt check and VSK, there are other errors and problems, but they are best solved after a normal diagnosis, otherwise a lot of time and money will be spent. Questions can be asked in the comments.

You were given a scanner, elm327, what systems can you diagnose? RX300 machine. Do you see airbag errors?

Only ELM327 engine and automatic transmission, pillows need a different scanner. Or you can use self-diagnosis to check for errors, it is tedious to close pins 4 and 13 in the diagnostic connector and calculate the error code by flashing the airbag lamp