P1113–P1131 O2 Sensor Bank 1 Sensor 1 (G39) - Internal Resistance too High
The part measures more electrical resistance than it should - typically corrosion, a loose pin or a failing component.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P1113 | O2 Sensor Bank 1 Sensor 1 (G39) - Internal Resistance too High | Investigate soon |
P1114 | O2 Sensor Bank 1 Sensor 2 (G130) - Internal Resistance too High | Investigate soon |
P1131 | O2 Sensor Bank 2 Sensor 1 (G108) - Internal Resistance too High | Investigate soon |
The definition
P1113: O2 Sensor Bank 1 Sensor 1 (G39) - Internal Resistance too High.
P1113 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
The same fault, the other numbering
The same fault carries two numbers:
- VAG 5-digit equivalent:
17521
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P1113 mean?
P1113 means O2 Sensor Bank 1 Sensor 1 (G39) - Internal Resistance too High. The part measures more electrical resistance than it should - typically corrosion, a loose pin or a failing component.
Can I drive with P1113?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
What is P1113 in VAG 5-digit numbering?
P1113 is fault number 17521 in VAG's own numbering.