P2084: Exhaust gas temperature sensor reading out of range (bank 1, sensor 2)
The exhaust temperature reading does not match what the ECU expects. An ageing sensor, an exhaust leak or the connector are common causes.
| Code | P2084 |
|---|---|
| System | Engine and transmission |
| Group | P20xx, Emissions: catalysts and AdBlue |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P2084 means
The exhaust gas temperature sensor watches exhaust heat to protect the turbo, catalyst or particulate filter, and to manage regenerations on diesels. The signal is there but does not fit the driving conditions or the readings from other exhaust sensors, or it changes too slowly. Sensor 2 is the second one counting from the engine; exhaust temperature sensors are numbered by their order along the pipe, and exactly where each sits (before or after the catalyst or filter) is up to each manufacturer.
Most common causes
- Sensor connector dirty or corroded by heat
- Exhaust leak near the sensor skewing the reading
- Aged sensor responding slowly
- Sensor fitted in the wrong position after a repair
- Heat-damaged wiring
Symptoms
- Engine warning light on
- Particulate filter regenerations may stop taking place
- Possible loss of power or limp mode
Can you drive with P2084?
With care You can drive with care, but without this reading the engine may limit power or skip particulate filter regenerations, leading to a clogged filter. Get it fixed soon.
Open the bonnetthe in-depth explanation
How to check it
With a cold engine that has stood for a while, the live sensor temperature should be close to the ambient temperature and to the other exhaust sensors. Once driving, it should rise steadily.
How to read and clear P2084 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2084 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2080 Exhaust gas temperature sensor reading out of range (bank 1, sensor 1)
- P2081 Exhaust gas temperature sensor circuit intermittent (bank 1, sensor 1)
- P2082 The exhaust gas temperature sensor (bank 2
- P2083 The exhaust gas temperature sensor (bank 2, sensor 1) fails now and then
- P2085 The exhaust gas temperature sensor (bank 1, sensor 2) fails now and then
- P2086 The exhaust gas temperature sensor (bank 2
- P2087 The exhaust gas temperature sensor (bank 2, sensor 2) fails now and then
- P2088 Camshaft position actuator A control circuit low (bank 1)
- P2002 Diesel particulate filter efficiency below threshold (bank 1)
- P2003 Diesel particulate filter efficiency below threshold (bank 2)
- P2004 Intake manifold runner control stuck open (bank 1)
- P2005 Intake manifold runner control stuck open (bank 2)
What does code P2084 mean?
The exhaust gas temperature sensor watches exhaust heat to protect the turbo, catalyst or particulate filter, and to manage regenerations on diesels. The signal is there but does not fit the driving conditions or the readings from other exhaust sensors, or it changes too slowly. Sensor 2 is the second one counting from the engine; exhaust temperature sensors are numbered by their order along the pipe, and exactly where each sits (before or after the catalyst or filter) is up to each manufacturer.
Can you drive with P2084?
You can drive with care, but without this reading the engine may limit power or skip particulate filter regenerations, leading to a clogged filter. Get it fixed soon.
How do you clear P2084?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2084 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
