P2466 is the general circuit code for the third exhaust temperature probe in the bank 2 exhaust path, so it only appears on engines with two separate aftertreatment lines. No manufacturer documents this exact code publicly. The bank 1 counterpart P242A shows how makers fill such a general code: Ford's 2023 diesels use it for a probe that departs more than 80 °C from its modelled value for 20 s, while other makers attach open-circuit detection to it. CARB requires every emission-relevant sensor to be checked for circuit continuity and plausibility. Expect the controller to distrust the reading, to pause regeneration or DEF dosing that relies on it and to light the MIL. Clear low and high signal faults of this probe go to P2468 and P2469 instead.
Medium severity. Can I keep driving?If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- MIL on
- Implausible or missing value for this probe in live data
- Filter regeneration or DEF dosing suspended
Most likely causes
- Temperature probe failed internally or open
- Connector or wiring near the exhaust damaged by heat
- Probe loose or not reaching into the gas stream
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2466 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 4: Emissions
- 66: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2466?
If the light is on steadily, take a highway drive or go to a repair shop soon. If the car is in limp mode or the light is flashing, do not push the engine.
What causes code P2466?
The most common causes are: temperature probe failed internally or open; connector or wiring near the exhaust damaged by heat; probe loose or not reaching into the gas stream.
Related codes
- P2467Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 3)
- P2468Exhaust Gas Temperature Sensor Circuit Low (Bank 2 Sensor 3)
- P2469Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 3)
- P246AExhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 2 Sensor 3)
- P242AExhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 3)
- P2473Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 4)
Sources
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.