2000 RX300 getting code PO141
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Driver School Candidate
Joined: Jul 2010
Posts: 6
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From: Georgia
2000 RX300 getting code PO141
Is there any tricks to try before replacing the O2 sensor? Reads O2 sensor heater circuit Malifunction Bank 1 sensor 2. I think this is the sensor at the cataletic convertor or downsteam. I erased the code by disconnecting the battery for about 30 minutes the check engine light went out but after about 40 miles it came back on. I checked the vacuum hose to the air filter and it was connected. Can someone tell the postive location of this sensor and can they be cleaned and reused? And a big thank you in advance!!!
Fred
Fred
CL Community Team
Joined: Apr 2004
Posts: 17,318
Likes: 203
From: Miami, Florida
Welcome to the Club
Bank 1, sensor 2 is underneath the vehicle behind the main catalytic converter. Just get underneath the vehicle from the driver's side and you'll see it. This is more an emissions thing than anywhere else. Does your code reader have readiness monitors on it (like EVAP, CAT, etc.)? See if you're getting a no cat there.
If you had a more advanced scanner (or access to someone with it), you could see the readings.
This sensor going bad won't affect driveability, but sometimes bad gas can trigger this sensor (I've had it happen in Mexico). I plan to replace mine (haven't since I got back) in the next month or so (even though I don't live in an emissions state).
This particular sensor is cheaper than the two upstream a/f sensor (which are distinctly different). It's Denso part 234-4215. Amazon usually has the best prices on these.
Some people like to clean these things with brake fluid or even something like a propane flame, but keep in mind at some point these sensors will go on the fritz.
I'd wait until you have another tankful of gas and then see where you stand with it.
Bank 1, sensor 2 is underneath the vehicle behind the main catalytic converter. Just get underneath the vehicle from the driver's side and you'll see it. This is more an emissions thing than anywhere else. Does your code reader have readiness monitors on it (like EVAP, CAT, etc.)? See if you're getting a no cat there.
If you had a more advanced scanner (or access to someone with it), you could see the readings.
This sensor going bad won't affect driveability, but sometimes bad gas can trigger this sensor (I've had it happen in Mexico). I plan to replace mine (haven't since I got back) in the next month or so (even though I don't live in an emissions state).
This particular sensor is cheaper than the two upstream a/f sensor (which are distinctly different). It's Denso part 234-4215. Amazon usually has the best prices on these.
Some people like to clean these things with brake fluid or even something like a propane flame, but keep in mind at some point these sensors will go on the fritz.
I'd wait until you have another tankful of gas and then see where you stand with it.
Thread Starter
Driver School Candidate
Joined: Jul 2010
Posts: 6
Likes: 0
From: Georgia
Thanks for the info. My scanner doesn't have that info but I think my friend has one that does. Since I posted this message the car is throwing a code 171 now. I put a can of injector cleaner in the gas tank a while back, I wonder if that has anything to do with this 171? It is drinking gas like crazy--- 1/2 a tank in 83 miles not good for my wallet. ha ha.
Thanks for your help.
Fred
Thanks for your help.
Fred
CL Community Team
Joined: Apr 2004
Posts: 17,318
Likes: 203
From: Miami, Florida
Thanks for the info. My scanner doesn't have that info but I think my friend has one that does. Since I posted this message the car is throwing a code 171 now. I put a can of injector cleaner in the gas tank a while back, I wonder if that has anything to do with this 171? It is drinking gas like crazy--- 1/2 a tank in 83 miles not good for my wallet. ha ha.
Thanks for your help.
Fred
Thanks for your help.
Fred
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