Possible causes
– Faulty Front Heated Oxygen Sensor Bank 1
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks
– Front Heated Oxygen Sensor Bank 1 harness is open or shorted
– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors
– Intake air leaks may be faulty
– Exhaust gas leaks
Tech notes
Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem.
There is a factory service bulletin for the following Honda models:
1998-2001 Honda Prelude
Honda Prelude Factory Service Bulletin Honda Prelude OBDII Code P0133
1998-2002 Honda Accord
Honda Accord Factory Service Bulletin Honda Accord OBDII Code P0133
When is the code detected?
The response of the voltage signal from the sensor takes more than the specified time.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– High Fuel Consumption
– Excessive Smoke from Exhaust
– High Fuel Consumption
– Excessive Smoke from Exhaust
P0133 HONDA Description
The front heated oxygen sensor (or O2 sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.
HONDA Technical Service Bulletins for P0133 code
2000 HONDA S2000 POWER TRAIN:MANUAL TRANSMISSION
2001 HONDA S2000 POWER TRAIN:MANUAL TRANSMISSION
2002 HONDA S2000 POWER TRAIN:MANUAL TRANSMISSION
2003 HONDA S2000 POWER TRAIN:MANUAL TRANSMISSION
2000 HONDA S2000 ENGINE AND ENGINE COOLING:ENGINE
2001 HONDA S2000 ENGINE AND ENGINE COOLING:ENGINE
2002 HONDA S2000 ENGINE AND ENGINE COOLING:ENGINE
2003 HONDA S2000 ENGINE AND ENGINE COOLING:ENGINE
1998 HONDA ACCORD INTERIOR LIGHTING
1999 HONDA ACCORD INTERIOR LIGHTING