98 LS400 Check Engine

[waqas300]

Hi Lexus gang,

My LS showing up check engine light. upon scanning the following codes came up.

P0135
P0305
P0430

How do we fix them. Also sometimes while going to the speed of 80km/h car jerks a bit.

[Exhaustgases]

Not a code reader but a top dollar scan tool can look into what is going on. That is the place to start. With out the scan tool it is then all guess work. When a code is set  the problem is sometimes something other than what the code identifies as the culprit.  Its a waste of time and money just guessing at it.

[sha4000]

17 hours ago, waqas300 said:

Hi Lexus gang,

My LS showing up check engine light. upon scanning the following codes came up.

P0135
P0305
P0430

How do we fix them. Also sometimes while going to the speed of 80km/h car jerks a bit.

P0135 point to the oxygen sensor on bank 1 sensor 1 which is the drivers side.

P0305 is a misfire in cylinder #5

P0430 catalyst Efficiency below threshold (bank 2)

[waqas300]

5 hours ago, Exhaustgases said:

Not a code reader but a top dollar scan tool can look into what is going on. That is the place to start. With out the scan tool it is then all guess work. When a code is set  the problem is sometimes something other than what the code identifies as the culprit.  Its a waste of time and money just guessing at it.

How to fix? 

[sha4000]

First of all what year is your LS, how many miles are on it and what kind of maintenance have you done in the last couple of years? It's not a quick fix. You have to figure out what is causing the codes.

[Exhaustgases]

How to fix.  Easy you either buy a $1000 to $10,000. scan tool and learn how to use it. Or you find some body or some out fit that has one, and see what they say, if nothing else make sure to get a print out of the info. The codes can end up meaning nothing related to the real problem. Also you can get a cheaper real time reading scan tool / code reader that will show how the O2 sensor is acting. Or you can just start tossing money at it and change parts. Change the O2 sensor, first and see if that fixes it. Best to just change all the up stream O2 sensors that is 2 of them.

If that doesn't fix all the codes then next the spark plugs, and keep working in that direction, if they don't clear the miss then wires caps etc.