what does this means KWP2000 and ISO9141? Shown on my Code Scanner

Those are not trouble codes. They have to do with the scanner protocols. https://automotive.softing.com/en/standards/protocols/kwp2000- can.html

Just found out the alternator need to replace. Thank you help.

What did you do for this problem? My car has the same error code

2007 Trailblazer keeps dying and throwing codes on obd KWP2000 and ISO9141. What does this mean

code 9141

The code 9141 means your code reader isn't connected properly.

I am puzzled with this Maxima! Recently tuned up with new coil packs, new air flow mass sensor, and plugs! It show code ISO 9141 on scanner and autoxone diagnosed it needs a tune up. Should I change PCV valve and air filter. It runs like it is not getting the proper fire

No harm in changing the air filter and PCV. I would try another scanner to see if there are any OBD2 codes.

Alguien. Me puede decir que es KWP2000 ISO9141de una ford expedition 2005

These 2 serial numbers are not trouble codes to your car. You simply need to turn key to ON not ACC and do not start it. Leave car engine off but key to ON and rescan.

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I am getting those codes that says scanner not properly hooked up but it is. My 06 Pacifica won’t start at all someone help please

Did you figure it out?

Guru995Z7H For me it was because my battery was too low. Did you figure yours out yet?

I have a 04 Lexus rx330 I keep getting these codes iso 9141 an kw2000

Please help me

I have the kw2000 and ISO9141 on in my 2014 Jeep Grand Cherokee can anyone let me know what these codes are.

I found a ground short. no more kw2000 and ISO9141, 07 chevy malibu ls.......:) clean all ground's

Is it a bad thing code is09141