Sensor 3 on bank 2 is a switching oxygen sensor behind a second converter or converter brick; it exists on Jaguar Land Rover's supercharged V6 and V8 (on both banks) and on Ford systems that monitor part of the converter volume. 'Delayed response' means the sensor starts reacting too late after a mixture change – unlike 'slow response' (P0145/P0165), where the transition itself is too flat. This code covers the rich-to-lean direction, tested during forced fuel cut-off. For sensor 2, GM checks whether the signal falls below 450 mV before a calibrated air mass has passed; behind two converters their oxygen storage buffers the change, so limits are wide. No manufacturer document using exactly this code was found – the Jaguar Land Rover bulletins list only P0142ff/P0162ff for sensor 3 – so the description rests on CARB's response requirement and the sensor 2 logic. There is no limp mode; the converter monitor cannot complete.
Medium severity. Can I keep driving?Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- Check engine light on
- No noticeable change in driving
- Catalyst readiness not set (emissions test)
Most likely causes
- Sensor 3 aged, sooted or oil-poisoned
- Exhaust leak ahead of sensor 3
- Converter with strongly differing oxygen storage (aftermarket or new)
- Sensor 3 heater weak
- Control module software
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
- It affects emissions.
What each character of P019C means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 1: Air and fuel
- 9C: Specific fault in that system
Frequently asked questions
Can I keep driving with code P019C?
Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.
What causes code P019C?
The most common causes are: sensor 3 aged, sooted or oil-poisoned; exhaust leak ahead of sensor 3; converter with strongly differing oxygen storage (aftermarket or new).
Related codes
- P019DO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 3
- P019AO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 3
- P014AO2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 2
- P0165O2 Sensor Circuit Slow Response Bank 2 Sensor 3
- P0162O2 Sensor Circuit Bank 2 Sensor 3
Sources
- law.cornell.edu: 13 CCR 1968.2
- gsi.ext.gm.com: 18OBDG03A Engine Diagnostics
- static.nhtsa.gov: SB 10106057 9340
- static.nhtsa.gov: SB 10096822 1020
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.