Hello, I recently acquired my first Lexus, Love the car, but I'm stuck with this check engine (CE) light issue. It's an 04 with ~70k miles.

CE and VSC light on. Code reads P0133. It was very cold that day, so I cleared it hoping it was a weather thing. (VSC stayed on but I've read how to jump it so I was not concerned)
CE light back on, same code. Seemed like bank 1 sensor 1 after searching. Bought a denso o2 sensor, attempted to replace myself but failed (I could barely touch it with the heat shield and limited space)
Went to my local mechanic, said replace oxygen sensor. He charged me 1/2 hour labor with my part and says its fixed.
CE and VSC light back on the drive home, NEW Code reads P0134.
Checked under and looks OK. (new sensor replaced, not loose, no visible damage)

For the time being, I have made an appointment at a local Lexus.
Do you think it is another (sensor, vacuum, plugs, etc) problem? and would you recommend this sort of fix at a dealership? I won't try taking shortcuts again, but also not looking to spend thousands.
Any help would be appreciated, thanks.

 

You changed the drivers side? You went from a slow read to an open circuit. Be sure it is snapped together tight. If it is you'll need to test it with a multimeter, to rule out you got a bad part.

 

Welcome to the forum and congratulations on your new acquisition.

Sorry but I'm not familiar with code # P0134 but I suspect that someone here on the forum will be or has the capacity to look it up. Good luck.

 

You can always go to local auto store, like Autozone. They will read the code for free. If it is oxygen sensor, you need to replace it. I am new with this engine, but I have owned Sequoia, and now Land Cruiser which has v8 as well. My experience is to replace all oxygen sensors at the same time. It seems that I would get a CEL for one bank, then soon I get another CEL for the other bank.

The part should not be too expensive - use only Denso, not some other brands. Dunno how much dealer will charge - I try to avoid the dealer myself haha

 

I agree with Coleroad.

He is saying that a P0133 code means the old O2 sensor was slow to respond. And a P0134 code means that the new O2 sensor is not reading at all.

So he thinks it is a faulty sensor, since that was the last thing changed. Or possibly the connector did not snap in all the way. Both of those makes sense to me.

I am wondering if your mechanic took the time to put in the sensor correctly. It seems like it should take more than half an hour to pull up the carpet and run the wires all the way through the floor board.

I wonder if he just cut off the wires and spliced them together. If he did not get a good connection it would read as an open circuit.

 

sensor 1 bank 1 is the pre cat sensor on the drivers side. So that one is pretty quick and easy. Seems like that is the sensor most have to replace on the sc430. I had to replace mine at 30 some thousand miles. Many others have posted on here about replace that same sensor. I wonder what makes that one fry on the sc 430?

oh, I was thinking too maybe one of the wires got pushed out of, or partially pushed out of the connector. Also, a wire could have broken.

 

I had a problem with oxygen sensors on my 03 sc and after replacing sensors three times I found out that the wire
had broken that goes to the sensor fixed wire problem solved

 

....knock on wood.....I've never had to replace an O2 sensor

 

Me too !!!!

 

the firing order shown is the same as a small block Chevy v8 since 1955. Thought my 430 felt like a small Chevy v8

 

....but your signature say's your Sc has 50k & my Sc has 235k...lol

 

Not yet on my SC but also never on my LS. Just got lucky, I guess. !!!

 

Taking back what I said about the LS. I just remember, about a year after we purchased it (1992) got a recall notice from the dealer to change out the O2 sensor, free of charge. Never replaced another one after that.