P2084 — Exhaust gas temperature sensor signal is faulty
The engine's exhaust gas temperature sensor on bank 1 after the turbo or catalytic converter is sending a signal that doesn't make sense to the computer. This usually happens because the sensor is faulty, wiring is damaged, or there's a problem with the exhaust system.
Common causes
The cause is almost always one of a few things. Here they are — P2084 rarely comes from anything outside this list:
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connectors
- Exhaust leaks near the sensor
- Sensor contamination or soot buildup
- Faulty engine control module (rare)
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Inspect and clean sensor connectors and wiring
- Check for exhaust leaks near sensor location
- Test sensor output with diagnostic tools
- Replace faulty exhaust gas temperature sensor
- Check and repair engine control module if needed
That is what holds for P2084 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
🔧 Related repair procedures
- AUDI: Removing and installing front exhaust pipe (right-side) with catalytic converter - vehicles with manual gearbox
- AUDI: Checking lambda probe and lambda control downstream of catalytic converter
- AUDI: Removing and installing front exhaust pipe (right-side) with starter catalytic converter and main catalytic converter - vehicles with manual gearbox or multitronic gearbox 01J
- AUDI: Removing and installing catalytic converter
- AUDI: Removing and installing front exhaust pipe (left-side) with catalytic converter - vehicles with multitronic gearbox
- AUDI: Removing and installing catalytic converter - vehicles with two turbochargers
- AUDI: Removing and installing catalytic converter with exhaust pipe - vehicles with engine code letters AVF, AWX
- AUDI: Checking Lambda probe and Lambda control after catalytic converter
- VW: Removing particulate filter with NOx storage catalytic converter
- AUDI: Removing and installing front exhaust pipe with catalytic converter and front silencer
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
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