cel is on again dtc's are p1130,p1133,p1135,po125 what to do?i just put a new coolant temp sensor in last week cause of the p0125 dtc but it came back.and when its cold it runs like crap and idles bad. but once its warm its fine,so please help.


oh its 2000 rx300

 

My 1999 threw the same codes and in the end it was the air-fuel sensor (AKA oxygen sensor). I will let some of the others chime in too, but I bet that is what it is. I also noticed than when that sensor is bad, it messes up the way your engine runs so much that it is likely to give other codes. The way to check is to clear all codes, drive it until it goes off, pull over, then read the codes. If you drive then you run the risk of more false codes.

 

which 02 sensor do i replace?

 

There appears to be a fault with the bank one, sensor one, O2 sensor.

It is in the rearward exhaust manifold.

 

any pics?so the one by the fire wall then?how hard is it to get too?

 

May I suggest a search with "22mm", the size of the special socket needed ...

https://www.clublexus.com/forums/sho...highlight=22mm

For example.

 

i already did and found it thanks though i have that socket already im a audi master tech at a audi dealership but just new to my wifes rx300 problems

 

Then this should be a simple task for you ...

Recommend disconnect the battery and observe the air bag precautions.