1999 Lexus ES300 Check Engine Light

LEXUS
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PATCHY123
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  • 4 POSTS
I have a 1999 lexus es300 with 80,000 miles and a v6 3.0L engine. The check engine light came on and I took it to a mechanic to get a diagnostic and he said one or two or three of the sensors will need to be changed. He was saying oxygen sensors. Is this a big problem. Is is something that needs to be fixed immediatley? What are the effects if not fixed too soon. And also what can go wrong?
Mar 19, 2007 at 5:30 PM
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SERVICE WRITER
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For one it will affect your gas mileage as the computer will make incorrect decisions based on false data. If it is causing a rich condition for example, damage may start to occur to the converter.

Your best bet is to replace them.
Mar 19, 2007 at 10:15 PM
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LOSTINMARS
  • ✓Experienced Mechanic
  • 222 POSTS
what was the code(s)?
Apr 9, 2007 at 8:04 PM

Suggested Repair

Confirm the stored trouble codes, then replace the oxygen sensors indicated by the diagnostic. Faulty sensor data can reduce fuel economy and, if the mixture runs rich, damage the catalytic converter.

Conversation Summary

The owner of a 1999 Lexus ES300 with a check engine light was told that one or more oxygen sensors may need replacement and asked how urgent the repair was. An expert said incorrect sensor data can hurt fuel mileage and that a rich condition may damage the catalytic converter, recommending replacement. Another expert asked which trouble codes were stored.

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