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What is P1135 code 2001 Toyota Highlander?

P1135 - Air/Fuel Sensor Circuit Slow Response (Bank 1 Sensor 1)

Possible causes:

• Faulty oxygen sensor

• O2 sensor connector is damaged or not connected

• Wiring issue between 02 sensor and ECM

• Vacuum leak

• Faulty fuel injector

• Intake air leak near MAF

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