Hey every one! @ what millage have your A/F sensors failed at? 60,70k or more?

 

Are you referring to MAF? Mass Airflow Sensor? This is normally covered in the powertrain-emission warranty to 72 months and/or 75K (if I am not mistaken).

 

No,the air fuel ratio sensor`s located in the exhaust manifolds. Their a high tech o2 sensor.

 

Was yours replaced under warranty?

 

Their still original @ 63900 miles. Dealer claims their good for around 70k. Depending on what fuel grade you run.

 

Believe it or not, when they go bad you will get a VSC light!

 

My VSC light came on just over 60,000. RX350, 2007. I was told it was the air fuel ratio sensor. Was charged over $200 for the part and 2.5 hrs labor...at $120/hour...and this was at a Toyota dealer.

 

My Bank1 o2 sensor started going on the blink around 160K. Hot days and uphill road worsend the condition. Came out without a fuss with a deep offset box wrench.

After replacement, it seems I need to give less gas pedal pressure .. could be psychological .. so monitoring my MPG.

Salim

 

Honestly most O2 / Air Fuel Sensors operate within a steady functional range for upwards of 120K. After that they begin to lose a performance edge which is when you begin to see them go out. On my last RX, I got 135 out of the bank 1 senors, and 165 out of the bank 2 sensor (post cat conv.).

If you are just looking to replace them, I wouldn't even worry about them until you reach 100K. My bet is that if you hooked a scanner up to yours now and got the live data, you would see them fluctuate within the acceptable ranges (you can use All Data to find the acceptable ranges).

 

Anyone care to guess one of the reasons why O2 sensors go bad early?

Dripping fluids on them when they are hot during routine servicing such as oil changes.

Best to put a rag over these while working in the engine bay. Just some peace of mind.

 

Heck, my old RX300 had the originals at 188k miles and car was still going strong with no lights or indications of failure.

 

48,000 miles mine failed. $550.00 in parts labor to replace. One of the many expensive repair reasons I will not be buying another RX. None of my other Japanese cars have been as expensive or unreliable. It's a great car when it works, but a horror when something breaks. At 50,000 i have more than $3K of non-warranty repair.

 

I must have a string of bad luck. B1s2 was replaced at 92000km/55K miles and B2s2 sensor had to be replaced at 130000km/75K miles neither covered under warranty

 

Not part of the emmisions warranty?

 

In CA they have special rules for their emissions program which I believe is longer than other locations. Otherwise, standard warranty.