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lexpert, Lexus Master tech
Category: Lexus
Satisfied Customers: 2100
Experience:  Master Certified with lexus, 8 years experience with Lexus
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Lexus ES 300: I have a 97 Lexus es300 with 170000 mi. It has

Customer Question

I have a 97 Lexus es300 with 170000 mi. It has squeaked by the last two smog checks with 51 out of 52 permissible on the low speed HC emission measurement. This time it's 77. Changed plugs and front bank oxygen sensor. What should we try next? Than ks.
Submitted: 1 year ago.
Category: Lexus
Customer: replied 1 year ago.
It is a 49-state car, operated in CA since it was about 6 mo. old. Cat was replaced 6 yrs. ago. All other readings were well within allowable range.
Expert:  FIXITMAN replied 1 year ago.
Hello, my name is Bobby. Thank you for the question. Can you tell me if the check engine light is on and how it is actually running?
Customer: replied 1 year ago.
The check engine light has not come on. The car runs great. It is regularly serviced.
Expert:  FIXITMAN replied 1 year ago.
Thank you. Do you have a scan tool that reads live engine data?
Customer: replied 1 year ago.
No. My mechanic does.
Expert:  FIXITMAN replied 1 year ago.
I would like to know what the fuel trim readings are when driving the car.
Customer: replied 1 year ago.
What are fuel trim readings??
Expert:  FIXITMAN replied 1 year ago.
They are readings that show what the computer is demanding for fuel.