Replacing an O2 sensor in Tacoma

I was throwing a signal saying left bank lean on my V6 with O2 sensor as the probable cause. My symptoms weren't as drastic as yours but cleaning the MAS (Mass Air Sensor) cured it. The check engine light hasn't came on since then. A lot cheaper than replacing the O2 sensor.

You can pull codes for free at Autozone.

Replacing the O2 Sensor is much like replacing a spark plug. You might need to buy a special socket, depending on how much access you have.

Or rent the tool for free at Autozone.

I bought the tool for under $10. I assume I'll need it again, so I added to the collection.

silly boy. it's held in by a flange and two bolts.

There is no AutoZone where I live (Newfoundland Canada)

I may have tracked down what is known as an Air Fuel Ratio Sensor locally, but people are stressing don't cheap out. DENSO apparently makes Toyota sensors so I like to try and get that brand.

do you have a Checker? Any large parts place should have a Mass Air Flow Sensor. Usually there is a refundable "core charge" for getting a new one. But try cleaning the one you have first. Especially if you ventured near the K&N oiled filter scam.

That's even better. I've not seen that method before ...

You really should pull the codes BEFORE you do anything else. Check the AutoZone Website to see if they have the same thing with a differennt name in Canada. If not, ask your favorite parts store if they have a Tool Loaner Program, and if they do, ask if they also loan the scan tool for OBD II.

if you have mini fingers with full 360 degree rotation. The new sensor comes with the gasket so all one would need is some hi temp sealer, maybe something to break the bolts loose (some type of penetrating liquid) and lots of patience.

I had a local mechanic check the codes and help me diagnose.

Local parts stores here can only get NGK brand for $400-600!! They were even surprised. I have tracked one down, a Denso for much cheaper.

Thanks for the replies everyone.

Recommend you check the engine codes before spending a lot of money. Actron makes a line of code readers that are inexpensive.

The $80 US model also resets your lights.

You can purchase O2 sensors at most US auto parts stores for about $120 US for Toyota OEM type Denso or Bosch. I've had good luck with the Bosch units. They fit my Tundra well. The code reader told me exactly which one to change #1 is forward and #2 is aft. The V-8s have 4 total. Don't buy the cheaper generic ones - you want the factory type connector plugs.

I've also had to replace a couple of ignitors. Again the engine codes pinpointed the problem unit. These are also about 120 each so trial and error gets expensive.

Agree you may want to clean your MAS and replace your air and fuel filters.

Good luck. Post back if no joy.

Bubba

When my K&N polluted my MAF sensor all I got was a check engine light and crappy gas mileage. It didn't noticeably impact the vehicle's performance.