JCC511

I have had problems with the O2 sensors throwing codes. Does anyone know which are commonly bad or what can be done on this. Thank you!

ES300NZ

it's a 21 year old car, the o2's should be worn out by now. you'll just have replace them.

if you're short on cash you can disconnect them, (unplug) and run the car without them for a while, the ecu will use a default value to replace the values they should have been providing.

generic replacement o2 sensors are perfectly fine to use.

JCC511

Fair enough. Are the O2 sensors easy to identify/change?

ES300NZ

it's this thing. It will be hard to get to the rear one, you need the car in the air. Safety first if you're doing that at home.

JCC511

I see two listed on the Napa website. Front of converter and rear of converter. Are there only two? Thank you for your help!

jaredmac11

The error code should give you the specific bay that you will need to replace. There are three I believe.

JCC511

That may depend on the code reader I am using. The one the guys at AutoZone have cannot pinpoint which one. I have a friend/coworker who may have a better reader.

jaredmac11

Do you have the codes? I hit a P0135 code not too long ago and it was the far back O2 sensor, the one that I had to reach under the car. The others should/could be accessible from the front and above.

JCC511

I need to get the the codes ran again. It has been a while. I know the check engine light is on and I also have the O/D OFF light blinking at a one second interval. How many O2 sensors are there? At least two different ones available I see, but I have heard of vehicles having multiple.

jaredmac11

I believe there are 3.

Steelfan

My '00 has three, one on each manifold and one behind the cat, that I know of. I had to replace the two in the engine bay a few years back. Easy one is pictured above. One in the back took some reaching and my buddy and I stripped out the threads a little getting the old one out. Threads were galled. Used the "old" front one we took out to run new threads in and installed the new one. No problems since. Make sure you get the correct one/ones. The leads for the electrical connectors are different lengths. And, they are A/F sensors.... Think the end is heated so a little more to them than a straight O2 sensor.

jaredmac11

Also, California cars have their own sensors. REally, dont take our word for any of this. The codes willt ell you what you need.

JCC511

Got the codes read and cleared. Going to try to get my inspection today since only one system of seven shows as "not ready".

catalyst not ready
P0170 fuel trim malfunction bank 1
P0115 engine coolant temperature circuit malfunction
P0773 shift solenoid E electrical

6 of 7 readiness monitors are complete

ES300NZ

So I take that as being,

1. catalyst not ready = replace o2 sensor either before or after catalyst
2. P0170 fuel trim malfunction bank 1 = replace air fuel sensor bank 1
3. P0115 engine coolant temperature circuit malfunction =replace engine coolant tempature sensor
4. P0773 shift solenoid E electrical =replace shift solenoid E
5. 6 of 7 readiness monitors are complete = no idea what this is about.

thats an odd collection of sensors, i wonder if rats have got to the wiring.

JCC511

I still have not done this, but I got a warning today for overdue inspection. Looks like Denso are the least expensive at Napa. Wait, maybe Bosch "universal" are. Napa only lists two. One front of catalytic converter and one rear of.