DIAGNOSTIC CODES 25(AIR-FUEL RATIO LEAN MALFUNCTION) AND 71(EGR SYSTEM MALFUNCTION)

  • Tiny
  • Richardcarson1
  • 1995 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 160,000 MILES

I bought this corolla and checked diagnostic codes. 25 and 71 are what flashed. I guess my first question is: I found that the main air cleaner intake hose was way loose on the air cleaner side. Would that being so loose (the clamp was not there and hose was almost disconnected) cause these two codes to flash.

Also can you tell me, and not quoting the things from book, bcuz I don't really understand, what steps in sequence, I can perform in order to cure these two codes?

Any and all answers are so greatly appreciated. Thank you. Respectfully, Richard Carson

Do you
have the same problem?
Yes
No
Friday, July 25th, 2014 AT 9:40 AM

1 Reply

  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,399 POSTS

Richard,
The two codes can be related, but the mass air flow sensor is after the air box so that wouldn't cause a lean mixture. Have you checked the engine for engine vacuum leaks? Have you checked the EGR to see if it is stuck open?

Was this
answer
helpful?
Yes
No
Saturday, July 26th, 2014 AT 5:38 PM

Please login or register to post a reply.

Other OBD1 Code 25 Questions