Probably, what's the code?
obd-II codes followed by the blinking light code in parentheses...
P0130, P0131 (1) primary HO2S low voltage
P0130, P0132 (1) primary HO2S high voltage
P0133 (61) primary HO2S slow response
P0135 (41) primary HO2S heater circuit
P0136, P0137 (63) secondary HO2S low voltage
P0136, P0138 (63) secondary HO2S high voltage
P0136, P0139 (63) secondary HO2S slow response
P0141 (65) secondary HO2S heater circuit