Potential causes of a P2196 code include; Oxygen (O2) or A/F ratio sensor or sensor heater malfunction; Open or short in O2 sensor circuit (wiring, harness); Fuel pressure or fuel injector problem; Faulty PCM; Intake air or engine vacuum leaks; Faulty fuel injector(s)

Read the code with an OBD-II scanner; Check the throttle body and pedal sensor connectors; Clean a dirty throttle body; do not force the valve by hand; Clear the code; some cars need an idle relearn after cleaning

P2196 on Toyota Corolla E140: O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1)

Short answer: P2196 means “O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1)”. The car’s computer has found a fault in the ETCS (throttle) system and turns on the Check engine light (MIL). First check: read the code with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P2196
System: ETCS (throttle)
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on

Likely causes

Potential causes of a P2196 code include
Oxygen (O2) or A/F ratio sensor or sensor heater malfunction
Open or short in O2 sensor circuit (wiring, harness)
Fuel pressure or fuel injector problem
Faulty PCM
Intake air or engine vacuum leaks
Faulty fuel injector(s)

What to check, in order

Read the code with an OBD-II scanner
Check the throttle body and pedal sensor connectors
Clean a dirty throttle body; do not force the valve by hand
Clear the code; some cars need an idle relearn after cleaning

Related on this car

Same code on other cars

← P2195 P2238 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.