Running Rich and Lean
#1
Running Rich and Lean(code 25 and 26) Help
What are the first things I should do when my car is throwing code 25 and 26? I have seen some threads on this, but i wanted to address the first things i should do to trouble shoot this problem. thanks guys
Last edited by GoldieLex; 07-01-05 at 11:19 AM.
#2
Super Moderator
maybe you could tell us verbatim what "the book" says about those codes? The DTC book usually have a distinct way of describing the codes and possible causes. If it's a rich/lean problem like your title says perhaps start by looking at your o2's.
#5
Originally Posted by VVT-i
You got a 1992 SC400, check your O2 sensors.
#6
Lexus Champion
You can take it to the dealer and let them do the " O2 RPM check" by using the scan tool and they can see the wave form on the scan tool. A new O2 may cost you around $200.00 each, plus labor.
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#8
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lean rich condition,25 and 26 check engine codes
This was for ls400, 1992, 178,000 miles.
I replaced o2 sensors, no luck.
Did a tune up, caps,rotors, spark plugs. Rich condition fixed -I guess new plugs helped that, but lean condition remained. Changed fuel pressure regulator (part# 23280-50010---$103.43 from irontoad.com) and all codes clear now.
I replaced o2 sensors, no luck.
Did a tune up, caps,rotors, spark plugs. Rich condition fixed -I guess new plugs helped that, but lean condition remained. Changed fuel pressure regulator (part# 23280-50010---$103.43 from irontoad.com) and all codes clear now.
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