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What is diagnostic code 27 on a 93 Toyota pick up 22re?

Code 27 on a 93 Toyota pickup with the 22RE engine typically indicates a problem with the vehicle's Oxygen (O2) sensor or its circuit. The O2 sensor is responsible for measuring the amount of unburned oxygen in the exhaust gas, and this information is used by the engine control unit (ECU) to adjust the air-fuel mixture.

When the ECU detects a problem with the O2 sensor or its circuit, it sets the diagnostic code 27. Some common causes of this code include:

- Faulty oxygen sensor

- O2 sensor wiring issues (such as loose connections or damaged wires)

- Issues with the ECU

- Vacuum leaks

- Exhaust leaks

It's important to note that the O2 sensor is a crucial component for ensuring optimal engine performance, fuel efficiency, and emissions control. If you experience diagnostic code 27, it's recommended to have your vehicle inspected and diagnosed by a qualified technician or mechanic.

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