Hello everyone, im new to the board and i just purchased a black SC300 w 142k miles this monday in houston for $4500. I also own a 93.5 N/A Supra so i know the drivetrain well.

I ran seafoam through the engine this afternoon and after driving around for about 30min the check engine light came on. I checked it and it threw code 71 which according to my supra manual is an EGR malfunction. I reset the ecu and the CEL hasnt come back on. Im assuming the codes are the same for each car, can someone confirm that code 71 is an EGR malfunction?

thanks,

rich

 

Welcome, Check in the engine forum, I'm sure there are a few threads about engine code.

 

this website confirms that it is an EGR malfunction.

http://www.troublecodes.net/Lexus/

 

Id NEVER put that stuff in my engine.

 

thanks guys! i forgot about search, its been down so long at supraforums i forgot there was such a thing

SCpwner thanks for the link, that confirms my question

 

its 90% EGT sensor, i have that too, if u keep resting it, its just going to come back on after X amount of miles, and the interval will just shorten.

 

yea my sc300 did it every time i jumped on the highway .i removed the egr system and used a 1/2 ohm resistor and problem solved

 

yeah it came on again this morning, so im gonna remove it sometime soon

 

Vacuum modulator is a likely cause of error code 71.

 

Are you sure, my scanner sead EGT Sens.

 

I doubt your sensor is wrong. I had a code 71 CEL a few years ago. My brother cleaned the EGR valve and lines and it was fine for a while. The CEL came back after a few months and it was intermittent. I described the symptoms to the mechanic when I had my 120K mile service done and he said it was most likely the vacuum modulator. He tested it and it was faulty. I find a general code that says "EGR malfunction" to be a bit frustrating.

 

If you don't feel like testing the system & want to try a quicky.
Remove the temp sensor & clean it off. The end gets carboned up
& the temp value is incorrect. (the carbon insulates the sensor tip
from reading true exhaust temp)