Recently I changed both engine air filters in my 07 LS460. Right after that car started and died in a second. After I turn off the power and restarted the car it worked fine. After 3-4 days in the morning car did the same thing died in a second. Tried multiple times but after the first start it doesn’t even engage the starter. Shows CHECK VSC sign. It shows error when connected with OBD scanners. Does anyone have any idea what could break in this car while changing the air filters.?

 

Sounds like you need to bring it to a shop that specializes in Lexus cars. An OBD2 scanner showing ERROR when plugged in shouldn't happen.

 

You need to pull error codes as it was stated above. You can check MAF sensor connections, look for poor connection, broken wires and things like that.

 

I have done bunch off things like checked for loose or broken connections or pipes. I even checked the fuses as I found some recommendations online. Checked battery. Unplugged it for 24 hrs to reset the codes. Unplugged the air flow sensors but No results.

 

Did you touch any ground wires recently? I would check ground points in the area where you worked.

It is usually the case that people don't like to disclose everything they did for what ever reason. It makes already hard cases nearly impossible.

 

Your scanner is low end and may have served your purposes in the past. Try it on another vehicle to see if the Zurich is working properly. If it is, you know it's your car. Scanners can stop working with no notice. If you don't have another vehicle to test your scanner. You can also take your car to any auto parts store for a free scan, if they get the same communication error, then you know it's your OBD2 connector or something on your car. Let us know if these diagnostic hints help you.

 

I've read of the fuel pressure sensor causing similar issues on GS models as well. Seems to be very uncommon on both cars.

https://www.clublexus.com/forums/ls-...l#post11496866

Copied from above link...

If anyone is having this following symptoms (2009 LS460):

Nothing happens when start button is pressed.
Electric fans come on when key/button is in acc position.
Check VSC system on dash
Cannot communicate with ECU.
Techstream shows U0100
Sometimes the car will actually crank (but not start) after is has been idle for some time.

What I found as the problem:
Fuel pressure sensor

The fuel pressure sensor is faulty and is pulling down the 5 volt supply to the ECU, which causes all kinds of havoc.

The fuel pressure sensor is located under the intake manifold. It is quite a job to get to and replace.

 

Sounds like you may have bumped/loosened a connection when you removed the air filter cover. If that's the case, they can be a ***** to find!

 

OK I have got it diagnosed by a mechanic. He confirmed after a lot of electrical cross checking it is the fuel pressure sensor. Now mechanic informed me that it is in the intake manifold so will have to change the gasket but while we are at it we should also change the O2 sensors as well. Should we change the O2 sensors.??? ( it needs 4,costs like $200+) any advice car has about 130k miles..

 

You should ask him to take you out for dinner and a drink first.

 

I’m also a big fan of sarcasm but can you please be clear abt what you trying to say.?

 

That you are getting screwed since the O2 sensors are nowhere near the fuel pressure sensor

 

Thank you. Can you tell what should be changed.? Bought this car a lil less than 2 years ago. I wanna maintain well. I was thinking maybe ignition coils & spark plugs. I am looking for some guidance..

 

That fuel pressure regulator's part number is from "Prestige lexus.com" who have it for $46

https://rb.gy/rvfrrb

FUEL INJECTION PRESSURE REGULATOR

Part Number: 2307038020
Supersession(s): 23070-38020; 7702050070; 7702050080; 7702050110; 7702050120; 7702050130

If the mechanic thinks you need to change the 02 sensors I think I'd listen; but I'd want to know what he sees that makes him think that. He might just be thinking since he has to remove the intake manifold to change that fuel regulator, you might as well replace the 02 sensors too while the intake manifold is off and these sensors are accessible. Since the car has >100,000 miles he's probably right.

Link to another post on this great site from somebody who has changed his 02 sensors and how he did it, showing what the chore requires being done to get at them:

https://rb.gy/6i66f5

https://www.partsgeek.com/catalog/20...en_sensor.html

If you want to change the ignition coils and spark plugs in the process and don't mind non-OEM to save a whole lot of money, this place has them for $132 for complete set of coils + spark plugs

http://tiny.cc/wl46wz.

 

Like Striker said the fuel sensor isn't in the same area as the O2 sensors and removing the intake and associated parts will not make it easier to access them. Also you didn't mention that there were any codes related to the O2 sensors and they aren't really a maintenance item. Buying anything from amazon for your car isn't really a good idea except for maybe an air freshener.