I check and see that DENSO 234-4623 is for downstream. But the sensor 1 bank 1 is a upstream?

 

Woops, my bad, it should have been DENSO 234-4622...

 

It is very difficult to replaces 3 spark plugs behind the intake, at last, I let the repair shop to replace 6 spark plugs and O2 sensor.
Thank Arsenii, I check the old O2 sensor and see that its resistor is broken.
I reset the Check Engine ON and continue to drive and see what will happen.

 

Well, perfect! Glad It went alright for you!

Let me know if you would have any other questions..

 

After replacing O2 sensor, I see that
- With the broken sensor: OBD-2 tester show the voltage quickly fluctuate from 0.1 to 0.7V
- With the good one: OBD-2 tester show the voltage fluctuate from 0.3 to 0.5V
So I think if can not measure the sensor, this situation can help us guess whether the sensor broken

 

That can indirectly mean that the sensor itself was living its last days, so you replaced it right on time. But in order to fully utilize such voltage test, you need to have the tool that can produce the graph of the voltage change, like a scope tool.

Also, you have a perfect voltage range with your new sensor, that is basically what you want to see. It means that your air to fuel ratio is good.

P.S. It is not a resistor, it is a heater coil that is wrapped around the sensor element..

Hoe this helps and best of luck!

 

After running 52 miles, the code P0510 appeared again. I will replace the throttle sensor today. Is it easy to fit the sensor with anything inside the throttle? And how to check to know it is fit good?

 

Basically you just need to unscrew the old sensor and place the new one.. The only thing to be mindful of is to be careful with the tab that attaches with the throttle, do not force it if it won't seat itself. And you should probably check the alignment of the sensor after the replacement, otherwise you will get the same exact issue (the alignment was discussed earlier in this thread).

Hope this helps and best of luck!

 

It is so easy to replace the TPS, disconnected the cable connector, opened 2 screws then the TPS dropped down. It seems that no torque force applying to the sensor from the inside. I put the new one at the old position, no force.
Start the engine and connect OBD-2 tester, the throttle now is measured 7.8%, not 10.2 % of the old one.
I cleared the code P0510, reset the trip and waiting what happens next.

 

I do not know if an OBD-2 tester can show many error codes at the same time or only shows one code even the vehicle has many error codes?

 

Sorry, didn't understand the question..
Are you asking if the OBDII scan tool can show all the codes that your ECU has? If so, it depends on the device that you are using and on the software that is supplied with it.

 

I wonder if OBDII scan tool can show all error codes or only shows only one code, and when this code is fixed, it will show another code?

 

It depends on the OBDII scanner that you have, and the software that was provided with it.

 

I really do not know after replace TPS sensor by a new one, my vehicle still has code P0510 ?

 

Did you try adjusting the sensor as it is explained in this thread? There is no point in replacing the TPS if you don't adjust it..