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Originally Posted by kidsusukigsxr
...can anyone tell me about the emissions control system diagnotic code 25 air-fuel raio rich malfunction. I don't know which sensor i need to change...
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- Diagnostic code 25 is "Air-Fuel Ratio Lean Malfunction" (i.e. not "rich" - that'd be code #26)
- Possible areas of concern are as follows (listed roughly in decreasing order of likelihood):
- Main oxygen sensor (a likely cause)
- Air/vacuum/boost leak (also a strong possibility)
- Water temp sensor (sensor corroded, due to infrequent coolant flushes)
- Ignition system (old spark plugs (copper?))
- Air flow meter (dirty/oily (from k&n oil?))
- Fuel line pressure (eg. bad fuel pump)
- Injector (dirty)
- Open or short in main oxygen sensor circuit
- Open or short in Injection circuit
- ECU
Of course, other members of the forum please feel free to correct, re-order, or add to this list.
kidsusukigsxr, please answer the following questions:- What year is your Supra? ...and is it turbo or n/a?
- What modifications were done to it?