Skip the auto shop - Our mechanics make house calls

Q: Replaced oxygen sensors, but code P0135 still visible - 1996 Lexus LX450

asked by on

I replaced the oxygen sensors with new ones; however, the new ones are still showing the code (from the code reader) like the old sensors: P0135. I have checked the ECU and it is functioning as it should. Would you please tell me the next step of where I should look in order to fix this code problem. Thank you.

A: P0135 is a "heater circuit" malfu...

P0135 is a "heater circuit" malfunction in the O2 sensor. This is usually a fused circuit. Check your Owners Manual to verify that it is fused, then check that fuse to make sure it isn’t blown ("something" caused the old one to fail, may have taken the fuse out with it). If that fuse is OK, you may have a wiring issue to the O2 sensor. A professional mechanic, like a certified technician from YourMechanic, can diagnose, inspect the heater circuit and repair this problem at your home or office.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Which starter should be installed - 1997 Lexus LX450

I would call the parts supplier you are considering ordering from to be sure you get the right part. Most have excellent parts professionals who can ask the right questions (vehicle 'build" date, which engine, etc.) and can guide you...

Q: Getting multiple codes

Hello. When you get these codes together it is typically the result of a vacuum leak. If there is too much air entering the engine, your truck will have idling problems and this will cause issues with the oxygen sensor...

Q: Car overheats after city driving

There are many potential causes for your overheating concern. The engine gets hotter in stop and go traffic because air is not being forced into the radiator the way it is at higher speeds. Since you said the water pump...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...