P1196moderate severityPowertrain
O2 Sensor 1/2 Slow During Catalytic Monitor
on 1996 Dodge Ram Van 3.9L V6 · 4WD
What this code means
The PCM has detected that the downstream oxygen sensor on Bank 1 is responding too slowly during the catalytic converter efficiency monitor. The downstream sensor should show a relatively stable voltage if the catalyst is working properly.
Symptoms
- Check Engine Light
- Failed emissions test
- Slightly reduced fuel economy
Common causes
- Aging downstream O2 sensor
- Exhaust leak between catalytic converter and sensor
- Wiring or connector corrosion
- Deteriorated catalytic converter causing abnormal readings
- Fuel system issue affecting exhaust composition
Diagnostic steps
- Monitor downstream O2 sensor voltage pattern on scan tool
- Compare upstream and downstream sensor activity
- Check for exhaust leaks near downstream sensor
- Inspect downstream O2 sensor wiring and connector
- Evaluate catalytic converter efficiency
Repair notes
Replace the downstream O2 sensor Bank 1 if it fails response time testing.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1