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1992 Lexus SC 300 code 71

Tiny
SHANNON WOOLSEY
  • MEMBER
  • 1992 LEXUS SC 300
  • 3.0L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 117,000 MILES
Here recently I did the head on this engine and code 71 keeps coming back. I researched and checked everything in the egr system. Nothing broken or clogged and all parts are working? Now let me ask the question? This car is a Japan model not US (Cal, ) it doesn't have the exhaust temp sensor. I had to get a ECU for the car also, so I'm wondering if that ECU is for a California model and the computer can"t read the exhaust temp sensor there for code 71?
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Wednesday, July 23rd, 2014 AT 2:01 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The temp sensor is probably an O2 sensor so if it's not there then it can't read it and the computer if it's California or federal will look for it. If the computer is not modified to not read that then it's going to look for it and not find. It cold be ashort between O2 and ecu if you have one hooked up. Of course there still cold be something wrong with engine like to much oil getting through to burn. So check pcv system as well for soft hoses and valve working.
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Thursday, July 24th, 2014 AT 5:59 AM

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