Freaking P0125
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
That would be awesome if someone measured the resistance of a working sensor heater (two silver contacts) and posted it here. Mine are 1 Ohm on both A/F sensors before catalyst.
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
I just replaced the bad A/F sensor with a Denso one bought at rockauto.com for $160 shipped. CEL code was P1130 and P1135, with P0171 and P0172 accompanying the bad sensor. So far after I clear the code, it has not come back. Bosch made a mistake a while back (labeling a o2 sensor as a A/F sensor), it sources from Denso so why bothers getting Denso second handed.
Lexus Champion
Joined: Jan 2005
Posts: 2,447
Likes: 9
From: CA
Check out this thread
http://us.lexusownersclub.com/forums...ic=23231&st=30
http://us.lexusownersclub.com/forums...ic=23231&st=30
From: Ravind Shrotria
5812 Coles Court,
Buford, Ga 30512
PH 770-614-8987
trikemann@hotmail.com
To, Peter Marks, President and CEO
Robert Bosch Corp.
38000 Hills Tech Drive
Farmington Hills, MI 48331
Dear Mr. Marks,
Re: Very Poor quality and Deception of Product Application
1. It is a sad occasion that I have to bring to your attention the poor quality of the product that is being marketed by Bosch automotive aftermarket.
2. Being a German trained engineer also in the automotive business ( Freudenberg-NOK) it hurts my pride that a company that I grew up with and have respected for innovation and superb quality has let me down.
3. I purchased a Bosch sensor part # 13333 from NAPA in Feb of 05. The application on this sensor was for a Lexus RX300.
4. The sensor failed (Code P1133) within six months and NAPA exchanged me one at no cost. This new sensor was manufactured by Denso and marketed by Bosch with the correct Toyota /Lexus part # etched on it.
5. This sensor did not work right after install (code P1133). I took the car to the Lexus dealer in Atlanta,Ga never doubting the quality/ of the new exchanged Bosch certified Denso part. I assumed that there was a problem with my diagnostics.
6. The dealer concluded that the Denso -Bosch sensor is an Oxygen sensor and not a A/F sensor as the application calls for a RX300. It does however have the correct part # etched.
7. Now the warranty from NAPA is expired and I am short by the cost of the sensor. This letter is not to seek a reimbursement but to apprise you of this Bosch- Denso relationship. Though it would be nice if some one did reimburse me the cost of the sensor $206, and the money I spent at the dealer $96 (diagnostics). This not about the money though.
8. I have now bought a sensor Denso part # 234-9009 and this has worked with no problems. ($167 from Rockauto.Com)
9. Perhaps you should evaluate your relationship with Denso as they may be selling bad sensors to Bosch on purpose to give Bosch a bad name. This is something your sales and marketing team should investigate.
10. There is a thread on the Lexus owners club of a similar situation with another lady undergoing the same thing.
http://us.lexusownersclub.com/forums...hp/t23231.html
Regards
Ravind Shrotria.
Copy to Denso Corp
Copy to NAPA
Copy to Toyota Lexus Corporation
5812 Coles Court,
Buford, Ga 30512
PH 770-614-8987
trikemann@hotmail.com
To, Peter Marks, President and CEO
Robert Bosch Corp.
38000 Hills Tech Drive
Farmington Hills, MI 48331
Dear Mr. Marks,
Re: Very Poor quality and Deception of Product Application
1. It is a sad occasion that I have to bring to your attention the poor quality of the product that is being marketed by Bosch automotive aftermarket.
2. Being a German trained engineer also in the automotive business ( Freudenberg-NOK) it hurts my pride that a company that I grew up with and have respected for innovation and superb quality has let me down.
3. I purchased a Bosch sensor part # 13333 from NAPA in Feb of 05. The application on this sensor was for a Lexus RX300.
4. The sensor failed (Code P1133) within six months and NAPA exchanged me one at no cost. This new sensor was manufactured by Denso and marketed by Bosch with the correct Toyota /Lexus part # etched on it.
5. This sensor did not work right after install (code P1133). I took the car to the Lexus dealer in Atlanta,Ga never doubting the quality/ of the new exchanged Bosch certified Denso part. I assumed that there was a problem with my diagnostics.
6. The dealer concluded that the Denso -Bosch sensor is an Oxygen sensor and not a A/F sensor as the application calls for a RX300. It does however have the correct part # etched.
7. Now the warranty from NAPA is expired and I am short by the cost of the sensor. This letter is not to seek a reimbursement but to apprise you of this Bosch- Denso relationship. Though it would be nice if some one did reimburse me the cost of the sensor $206, and the money I spent at the dealer $96 (diagnostics). This not about the money though.
8. I have now bought a sensor Denso part # 234-9009 and this has worked with no problems. ($167 from Rockauto.Com)
9. Perhaps you should evaluate your relationship with Denso as they may be selling bad sensors to Bosch on purpose to give Bosch a bad name. This is something your sales and marketing team should investigate.
10. There is a thread on the Lexus owners club of a similar situation with another lady undergoing the same thing.
http://us.lexusownersclub.com/forums...hp/t23231.html
Regards
Ravind Shrotria.
Copy to Denso Corp
Copy to NAPA
Copy to Toyota Lexus Corporation
Lexus Test Driver
Joined: Jul 2001
Posts: 959
Likes: 2
From: New Jersey
"P01135 A/F Sensor Heater Circuit (Bank 1 Sensor 1) Replaced
You can ohm the 2 black wires and you will have an open circuit. The replacement sensor much read between .8 and 1.4 ohms to work properly and not generate the P1135 code. A Denso generic has a resistance of 8 ohms across the heating element and vehicle will still generate a P1135 code. The Bosch replacement would not correct the P1135 code. I did not measure the resistance across the heating element. Installed Toyota 89467-48011 which has resistance of 1.2 ohms and problem is solved"
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
I don't know who posted this or where but I had it saved in my file on RX CEL codes and fixes:
"P01135 A/F Sensor Heater Circuit (Bank 1 Sensor 1) Replaced
You can ohm the 2 black wires and you will have an open circuit. The replacement sensor much read between .8 and 1.4 ohms to work properly and not generate the P1135 code. A Denso generic has a resistance of 8 ohms across the heating element and vehicle will still generate a P1135 code. The Bosch replacement would not correct the P1135 code. I did not measure the resistance across the heating element. Installed Toyota 89467-48011 which has resistance of 1.2 ohms and problem is solved"
"P01135 A/F Sensor Heater Circuit (Bank 1 Sensor 1) Replaced
You can ohm the 2 black wires and you will have an open circuit. The replacement sensor much read between .8 and 1.4 ohms to work properly and not generate the P1135 code. A Denso generic has a resistance of 8 ohms across the heating element and vehicle will still generate a P1135 code. The Bosch replacement would not correct the P1135 code. I did not measure the resistance across the heating element. Installed Toyota 89467-48011 which has resistance of 1.2 ohms and problem is solved"
Anybody has any idea what the difference between "Denso generic" and "Toyota Denso"?
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
Both say "TOYOTA 89467 48011 Denso 0201".
Maybe I did something stupid but I took both of them out, soaked them in concentrated alkali for several hours and then washed with water and dried with 150 psi air. Too bad they are designed in such a way so the cover (shell with little holes) cannot be removed to clean ceramics inside.
Anyway, after I installed them back, P0125 stopped coming on.
Drove for 25 miles with 16 MPG average (this is some improvement over yesterdays 8 MPG).
Only P0171 is pending.
So if those codes has to do ANYTHING with A/F sensors, this probably means the sensors are DEFECTIVE. By specs they are designed to last 150,000 miles not 75 miles like in my case!
I forgot to mention that I also swapped them between banks.
Original part number was 89467-48010 but it was superceded by 89467-48011.
I really don't want to spend $280 on another pair.
PS: Toyota of Hollywood have them for $136.80 each.
This is how they looked like after bath:
Maybe I did something stupid but I took both of them out, soaked them in concentrated alkali for several hours and then washed with water and dried with 150 psi air. Too bad they are designed in such a way so the cover (shell with little holes) cannot be removed to clean ceramics inside.
Anyway, after I installed them back, P0125 stopped coming on.
Drove for 25 miles with 16 MPG average (this is some improvement over yesterdays 8 MPG).
Only P0171 is pending.
So if those codes has to do ANYTHING with A/F sensors, this probably means the sensors are DEFECTIVE. By specs they are designed to last 150,000 miles not 75 miles like in my case!
I forgot to mention that I also swapped them between banks.
Original part number was 89467-48010 but it was superceded by 89467-48011.
I really don't want to spend $280 on another pair.
PS: Toyota of Hollywood have them for $136.80 each.
This is how they looked like after bath:
Last edited by Meetya; Jun 17, 2007 at 03:51 PM.
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
Ok, I just figured that O2 sensor after catalyst also has a heater. Had to remove driver's seat to measure its resistance. It is 13.4 Ohms. Good (supped to be between 11 and 16). Want to take the sensor out and inspect/clean.
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
Cleaned the third O2 sensor. Didn't damage anything. Solved nothing. Very sure that new top sensors are defective.
Some pictures for those ... like Lexmex, you know, cool people ;-)
This is the sensor after 150,000 miles. Lots of semi-sticky gel deposits (although it is wet at base because of WD40).
After cleaning (it is as clean inside as it is outside, although you cannot see thru holes):
This is how it was done (don't try this at home, my fingers still burn).
Alkali before:
After 1 hour of soaking:
Some pictures for those ... like Lexmex, you know, cool people ;-)
This is the sensor after 150,000 miles. Lots of semi-sticky gel deposits (although it is wet at base because of WD40).
After cleaning (it is as clean inside as it is outside, although you cannot see thru holes):
This is how it was done (don't try this at home, my fingers still burn).
Alkali before:
After 1 hour of soaking:
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Lexus Champion
Joined: Jan 2005
Posts: 2,447
Likes: 9
From: CA
This A/F sensors failure have become common as mileage starts to get up there. I will do a Photo guided DIY thread this weekend.
BTW, after two weeks of driving, there is no different as I can tell from Toyota OEM and Denso aftermarket. They are both made by Denso so the result is expected.
BTW, after two weeks of driving, there is no different as I can tell from Toyota OEM and Denso aftermarket. They are both made by Denso so the result is expected.
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
This A/F sensors failure have become common as mileage starts to get up there. I will do a Photo guided DIY thread this weekend.
BTW, after two weeks of driving, there is no different as I can tell from Toyota OEM and Denso aftermarket. They are both made by Denso so the result is expected.
BTW, after two weeks of driving, there is no different as I can tell from Toyota OEM and Denso aftermarket. They are both made by Denso so the result is expected.
Lexus Champion
Joined: Jan 2005
Posts: 2,447
Likes: 9
From: CA
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
What is your current gas mileage? Mine is 12-14 MPG on a highway. I need to get freeze frame data readed from them... I will try to do it today.
Lexus Champion
Joined: Jan 2005
Posts: 2,447
Likes: 9
From: CA
Mine was 18mpg with bank 1 sensor 1 bad, I normally get close to 20 mpg.
Check out this helpful diagnostic pdf from Toyota, it explains A/F sensor vs O2 sensor well. But probably more importantly, I found the heater circuit is bad, you may get P0125 (P9). See p10 for diagnostic diagram.
http://www.autoshop101.com/forms/h37.pdf
Check out this helpful diagnostic pdf from Toyota, it explains A/F sensor vs O2 sensor well. But probably more importantly, I found the heater circuit is bad, you may get P0125 (P9). See p10 for diagnostic diagram.
http://www.autoshop101.com/forms/h37.pdf
Thread Starter
Pole Position
Joined: Mar 2007
Posts: 362
Likes: 2
From: Moscow, Russia
Mine was 18mpg with bank 1 sensor 1 bad, I normally get close to 20 mpg.
Check out this helpful diagnostic pdf from Toyota, it explains A/F sensor vs O2 sensor well. But probably more importantly, I found the heater circuit is bad, you may get P0125 (P9). See p10 for diagnostic diagram.
http://www.autoshop101.com/forms/h37.pdf
Check out this helpful diagnostic pdf from Toyota, it explains A/F sensor vs O2 sensor well. But probably more importantly, I found the heater circuit is bad, you may get P0125 (P9). See p10 for diagnostic diagram.
http://www.autoshop101.com/forms/h37.pdf
Thanks for the pdf, but I red it already.