P2245 — Oxygen sensor voltage signal is too low
The engine's oxygen sensor on bank 1, sensor 1 is reporting a voltage lower than expected. This sensor helps the engine control module adjust fuel mixture for efficient combustion. A low voltage reading can indicate a wiring issue, a failing sensor, or contamination.
Common causes
The cause is almost always one of a few things. Here they are — P2245 rarely comes from anything outside this list:
- Faulty oxygen sensor
- Damaged or corroded wiring/connectors
- Exhaust leaks near sensor
- Contaminated sensor from fuel additives or oil
- Engine control module fault (rare)
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Inspect and repair wiring and connectors
- Check for exhaust leaks and fix if found
- Clean or replace the oxygen sensor
- Clear error codes and test drive
- Replace engine control module if all else fails
That is what holds for P2245 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
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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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