Car felt very lump and hesitating under part throttle , then seemed to be fine, then again it hesitated worse - full throttle and higher revs it seemed to be fine again but then all of a sudden CHECK EMISSIONS light illumunated. #
OBD reader has 2 codes:
P0135 - 02 Sensor Heater Circuit (Bank 1 Sensor 1)
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
I presume the O2 sensor needs replacing, but there's 2 as I understand it, 1 pre-cat and one after? - is there any way to know which one has failed and needs replacing?
If I drive the car in the meantime can it cause engine issues?
Thanks for any help in advance!
(Car has KTEC manifold and decat, if it's relevant)
OBD reader has 2 codes:
P0135 - 02 Sensor Heater Circuit (Bank 1 Sensor 1)
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
I presume the O2 sensor needs replacing, but there's 2 as I understand it, 1 pre-cat and one after? - is there any way to know which one has failed and needs replacing?
If I drive the car in the meantime can it cause engine issues?
Thanks for any help in advance!
(Car has KTEC manifold and decat, if it's relevant)
