Subaru 1983 – 1988 Carbureted models DTC 23 – Oxygen sensor or circuit (1983 to 1988)/pressure sensor or circuit (1983 to 1985)
DTC 23 meaning on Subaru 1983 – 1988 Carbureted models
DTC 23 indicates a fault related to the oxygen sensor or circuit in Subaru 1983 – 1988 Carbureted models. In some earlier models (1983 to 1985), it could also refer to a pressure sensor or circuit issue.
Subaru 1983 – 1988 Carbureted models DTC 23 symptoms
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Black smoke from the exhaust
Subaru 1983 – 1988 Carbureted models DTC 23 causes
- Failed oxygen sensor
- Wiring or connector issues in the oxygen sensor circuit
- Exhaust leaks affecting sensor readings
- Faulty pressure sensor (in earlier models)
Subaru 1983 – 1988 Carbureted models DTC 23 seriousness
The seriousness of DTC 23 lies in its impact on engine performance and emissions. Ignoring this code can lead to decreased fuel efficiency, increased emissions, and potential damage to the engine over time.
How to diagnose DTC 23 on Subaru 1983 – 1988 Carbureted models
- Use an OBD-II scanner to retrieve the specific fault code
- Inspect the oxygen sensor and its wiring for any visible damage
- Check for exhaust leaks that could affect sensor readings
- Test the sensor’s voltage output using a multimeter
How to fix DTC 23 on Subaru 1983 – 1988 Carbureted models
- Replace the oxygen sensor if it is faulty
- Repair any damaged wiring or connectors in the sensor circuit
- Address any exhaust leaks to ensure accurate sensor readings
- For earlier models with pressure sensor issues, replace the faulty sensor
How to erase DTC 23 on Subaru 1983 – 1988 Carbureted models
To clear DTC 23 from the ECU’s memory, you can:
- Use an OBD-II scanner to clear the code
- Disconnect the car’s battery for a few minutes to reset the ECU
- Ensure the underlying issue causing DTC 23 is fixed before clearing the code
Recommended tools for Subaru 1983 – 1988 Carbureted models diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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