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LGAFF
02-01-2009, 06:38 PM
Is Code 64 a lean right bank?


This is on a 1990.
LGAFF
02-01-2009, 07:59 PM
Looks to me like a bad O2 or bad ground on the O2, does that sound correct?
XfireZ51
02-01-2009, 11:34 PM
Code 64 is a Lean O2 sensor reading. What was happening when the code set? The ECM was seeing a too low O2 sensor reading for at least 2 sec.
I would change the O2 sensors anyway but wouldn't count on the fact that its a defective O2 sensor.
LGAFF
02-01-2009, 11:39 PM
Went on while cruising.....not hard accel or anything. Car ran fine.
XfireZ51
02-01-2009, 11:46 PM
Went on while cruising.....not hard accel or anything. Car ran fine.

Pull the battery, see if you get code again.
Paul Workman
02-02-2009, 06:21 AM
Went on while cruising.....not hard accel or anything. Car ran fine.

My 95 LT1 Vette went thru 4 sensors - all failed resulting in a "lean" code.

My AutoXRay scanner sorted it out very quickly. You can get a bird's eye view of the cross counts and the range averages for both sides. It's available, if you want to use it.

P.