Lexus Error Code P1135: How to Fix It

Q: What causes Lexus P1135 error code?

P1135 is typically caused by a faulty air-fuel ratio sensor heater element, damaged wiring or connectors, blown fuses, or rarely, ECU issues. The heater circuit helps the sensor reach operating temperature quickly for accurate readings.

Q: Can I drive with P1135 code?

You can drive short distances, but prolonged driving isn't recommended. The code may cause poor fuel economy, rough idle, failed emissions tests, and potential catalytic converter damage over time.

Q: How much does it cost to fix P1135?

DIY repair costs $50-200 for a replacement sensor. Professional repair typically ranges $200-400 including labor. Costs vary depending on sensor location accessibility and local labor rates.

Q: How long does an air-fuel ratio sensor last?

Air-fuel ratio sensors typically last 60,000-100,000 miles. Factors like fuel quality, engine condition, and driving habits affect lifespan. High-mileage vehicles may need replacement sooner.

Q: Will P1135 cause my Lexus to fail emissions testing?

Yes, P1135 will likely cause emissions test failure. The air-fuel ratio sensor is crucial for maintaining proper emissions levels, and most testing facilities require all engine codes to be cleared before passing inspection.

Abstract

Lexus error code P1135 indicates a malfunction in the air-fuel ratio sensor heater circuit for Bank 1, Sensor 1. This sensor helps your engine maintain optimal fuel efficiency and emissions control by monitoring the oxygen content in the exhaust gases before they reach the catalytic converter.