Skip the auto shop - Our mechanics make house calls

Q: O2 sensors

asked by on

I have 2 bad o2 sensors. Bank 1 sensor 2 and bank 2 sensor 2. How do i know which ones to purchase? They usually have names like left or right upstream or downstream. Please help. Thanks!

My car has 183000 miles.
My car has an automatic transmission.

Bank 1 is the cylinder bank that has number 1 cylinder. In your case that would be the front bank. Each bank has two oxygen sensors, the upstream sensors are sensor 1 and the downstream sensors are sensor 2. So in your case, you need both downstream sensors. Replacing Oxygen sensors involves working underneath the car and requires some special tooling. If you decide you don’t want to do the job, Call your mechanic to schedule an Oxygen sensor replacement at your home and at your convenience.

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: i just changed transmission but i can not turn on engine......

Hello. If you replaced your transmission and the engine is not starting the first thing I would do is to try to make sure the engine is rotating. You can do this by putting a breaker bar onto the crankshaft...

Q: Disable or bypass factory security system

To temporarily override the system, see these instructions. A permanent bypass requires re-engineering the system because engine immobilizers these days rely on multiple electronic modules and chips, the very removal or modification of any one of which, or reconfiguration, will...

Q: 01 camry put New starter in alt good 12v bat read 14.8v car starts on cold engine when car is warmed up and driven only clicks

What you are describing sounds like a faulty starter solenoid. A faulty starter solenoid will generally produce a clicking sound when turning the key. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.