The Check Engine Light may illuminate due to an O2 sensor heater fault. Most commonly the affected O2 sensor will need to be replaced to correct this concern.Google+
Car Problem Reports
Lexus LS430 Check Engine LIght With Code P0135, P0141, P0155, or P0161
Lexus LS430 Problem
Average Mileage: 100,723 mi (68,000 mi - 134,500 mi)
Visitor, 2006 Lexus LS430, 74,000 mi
The check eingine light came on an I had it serviced at the Lexus dealership. I was told it was an o2 sensor. Cost of repair $450.
My check engine light has been on for this problem for over a year. I haven't gotten it repaired yet.
Visitor, 2002 Lexus LS430, 68,000 mi
Visitor, 2001 Lexus LS430, 134,500 mi
my check engine light came on-care is running fine, it seems..what could this be?
check engine light on code po155 replaced by lexus at £179
Visitor, 2002 Lexus LS430, 91,000 mi
The o2 sensor light kept coming on and it had to be replaced.