Service Engine Soon Light - ZR-1 Net Registry Forums

bigd · 07-31-2005

The other day when coming home my '90 Z almost stalled when coming to a stop. This morning when I started it (and it took much longer than normal to crank) the SES light came on after 30 seconds or so of idling. It is throwing two codes; 45-Left oxygen sensor voltage was over 0.75 volts for 30 seconds when the throttle angle was above 4% during closed loop operation. 65-Right oxygen sensor voltage was above 0.75 volts for 30 seconds of closed loop operation when the throttle angle was above 20% or below 2.7%.

I don't think both sensors would go bad at the same time. Is there something that could cause both sensors to give these readings?

Thanks, Don

07-31-2005	#1
bigd Join Date: Apr 2005 Location: Tallahassee, FL Posts: 17	Service Engine Soon Light The other day when coming home my '90 Z almost stalled when coming to a stop. This morning when I started it (and it took much longer than normal to crank) the SES light came on after 30 seconds or so of idling. It is throwing two codes; 45-Left oxygen sensor voltage was over 0.75 volts for 30 seconds when the throttle angle was above 4% during closed loop operation. 65-Right oxygen sensor voltage was above 0.75 volts for 30 seconds of closed loop operation when the throttle angle was above 20% or below 2.7%. I don't think both sensors would go bad at the same time. Is there something that could cause both sensors to give these readings? Thanks, Don __________________ Don 1990 Dark Red Metallic #1587