Join Date: Mar 2011
Location: Daly City
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I followed your directions which were great by the way, but my problem continues. I did a code read after installing the new b1s2 oxygen sensor made by lexus and the code reads p0141. What I want to know is WHERE is the "heater circuit?" nothing more nothing less, a picture by anyone would be great. I am assuming the heater circuit is the connector attached to the oxygen sensor.
The heater circuit is a part of the 02 sensor. Inside of an O2 sensor is a sensor signal circuit and a heater circuit. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The two black wires on an OEM Denso sensor are the heater wires and should read about 10-14 ohms @68*F, IIRC.
P0141 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank1, Sensor2)
Replacing the correct sensor should have solved the problem. Check to see if the connection harness is tight(by the air box) and possibly reset/clear the code by pulling the negative off the battery for a few minutes. Other than that, they either replaced the wrong sensor or the new one is bad, which they should replace free of charge.
There are at least 5 related codes just for that sensor's(B1S2) heater circuit. That's because our ECM is that damn sensitive. Normally any of these codes would indicate the heater circuit is open, shorted, or simply malfunctioning. I would check the connections and if they look ok, then I would replace the sensor and clear the code.
P0054-O2 sensor heater resistance B1S2
P0036-O2 sensor heater control circuit B1S2
P0037-O2 sensor heater control circuit low B1S2
P0038-O2 sensor heater control circuit high " "
P0141-02 sensor heater malfunction
I have been lurking for about a week and wanted to post on here to make sure I get the right O2 sensor and have the right location. The Code im throwing up is a P0430 Catalyst System Efficency Below Threshold (Bank 2). I have been reading on this forum and using the search function to make sure I have the right location and right sensor but want some reassurance. Is this O2 sensor it is identifying the one under the passenger area that you can plainly see and that some have removed the seat to get to it easier? I want to verify before I start taking one out and changing it. From what I have read this is the right location. I am at Densoproducts and sparkplugs.com and on eBay and want to verify im looking at the right o2 sensor too. Since the dealer wants 190 for this sensor, i'm going to try and change it for cheaper
Densoproducts.com shows Front cylinders 4-6, front upper cylinders 1-3 , rear cylinders 1-3 and rear cylinders 4-6. It doesnt mention the one after the cat (downstream I guess) . This is the one im looking at on ebay New Rear Bosch O2 Oxygen Sensor Lexus IS300 2002 2001 Parts Auto Car | eBay
I bought the car a week and a half ago and have unplugged the batt 2 times and cleared the code twice. The same code keeps popping up. I ran seafoam in the tank as well. I test drove the car 3 times and it never came on. I got 91 gas in it (previous was putting 87 in mostly and occasional 91) and about 20 miles later the light came on.
Thanks again to the community for your help
BTW its a 2001 Lexus IS300 with 203k miles. (high miles I know, but I had faith in it, no leaks no burning)
|or know where i can buy the part?|
Perfect, Thank you Jasonm444. I may just go ahead and purchase the Denso. If I get the one with the plug already on it, I should still be able to just move the seat forward right and disconnect the current one and connect the other? I don't really wanna deal with air bag change of deployment.
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