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Check engine light on your 1995 Lexus ls 400 stays why?

Some possible reasons are:

- Oxygen Sensor Failure

- Faulty or Loose Gas Cap

- Catalytic Converter Issues

- Ignition Coil Problems

- Evaporative System Leaks

- MAF (Mass Air Flow) Sensor Failure

- Bad/Old Spark Plugs.

If your 1995 Lexus LS 400 displays a persistent check engine light, getting immediate diagnosis is recommended through professional diagnostics with a scan tool to determine the underlying issue and receive appropriate repairs .