Hi all. My 05 MCS threw a code this week and scanning says 02 sensor has gone bad. Who might have the best deal for an OEM?

 

Make sure everything upstream of the O2 sensor is good first.

Which code ode did your car report?

Whatever you do, get the NGK 25648. From what I saw on searches, best to get the factory part and not the Bosch or some other generic brands.

My son's car made it to 219K miles till the rear O2 went bad. We checked everything from the throttle body, MAP sensors, vacuum lines, and exhaust inspected for leaks.

 

I forgot to ask Advanced guy what the number was but he said oxy sensor. This confuses me as I too bought the NGK 25648, but it was only last July and put 30,000 miles on it. Wondering if it still might be the gas cap. Light went off on Friday and has stayed off since (got gas on Friday). Would a gas cap throw the same code? Gas mileage has stayed the same too...

 

What brands and octane fuel are you using? (it makes a difference).

 

Always 93 octane and either Murphy's or Shell. rarely Mobile or BP. No rot gut stuff.

 

I had a one-ball mod to the exhaust in January, however. Would that affect it?

 

Can't be the fuel then. I had to learn that the hard way using discount supermarket gas 80K miles ago. No idea about the down stream mod.

 

My car had been throwing a code for a few months and finally got around to getting one fo the NGK Sensors...tried and tried to get the O2 sensor off but it won't budge and I didn't feel up to taking the exhaust off...I have been running Seafoam through it for a few months off and on...always 93 Oct ...I did a complete ECU reset and the O2 sensor hasn't shown back up...Oh...145K with original exhaust on our R50.

 

There's two O2 sensors so there would be two different codes.

P0132 - Bank1 Sensor 1 - Upstream
P0136 - Bank1 Sensor 2 - Downstream

There's also a particularly fun one also,P02096. Could be a number of things upstream or could also be a bad post cat O2 sensor.

Which O2 sensor did you replace?

 

A one ball wouldn't affect the oxygen sensors in the slightest, you could have a number of things going on:

1. Actual sensor problem
2. Catalyst faults
3. Vacuum leaks
4. Electrical problem (shorts, broken connections)
5. Even throttle body problems

You should find a quality scan tool and have a diagnostic done, sometimes people think they need an oxygen sensor it turns out to be a small exhaust leak or vacuum leak.

But if you do end up needing a sensor, we have them in stock ready to ship.

NTK Oxygen Sensor

 

My son replaced it last July. I'm waiting to hear back from him when he gets out of class. Are both sensors the same?
Also, Cenla Mini, how did you reset the ECU? Might be worth trying as well.

 

Both sensors are the same.
We offer these NTK ones that work fine
https://www.waymotorworks.com/ngk-o2-oxygen-sensor.html

 

So what is the story with the $18 O2 sensors on Ebay? Are they for real? It says they are for my 2003 Mini.


What about cleaning? Does that ever work?


Thanks,

 

For example, here's one on Amazon for $18:

 

I've bought several $15 ABS sensors with happy results but if you're in a SMOG state - sometimes the few bucks difference is worth the time with these parts. When looking at the socket in the third picture of that amazon listing - the two channels on the bottom inside of the socket are slightly offset on an OEM r50 o2 sensor. Just pulled mine and had this issue...

 

When I removed the O2 sensor, I found that the insulation on the wires had been rubbed off. I wrapped each wire individually in electricians tape and then another layer wrapping the all 4 wires then re-installed the sensor. My check engine light went out so I am hoping this fixed the problem.