I purchased a 1997 Chevrolet Tahoe, 4WDr, 171,000 miles, 5.7L engine and the service engine light soon continues to be lit. I changed both oxygen sensors, got it tuned up, and have added fuel injector cleaning fluid to a tak of gas. I got it scanned this afternoon with the scan indicating " rich fuel mixture" for both banks. After the computer was re-set I drove it 180 miles on the interstate without the engine light becoming lit. I then turned it off, waited about 30 minutes, and then went to the post office and it lit again after about 1/4 mile.
Saturday, May 5th, 2007 AT 9:03 PM