Is Bosch A/f Sensor Compatible With 1999 Es300?

[Camelot.King]

Hi

My car is 1999 ES300. Couple months ago, I got ECL and TRACOFF came up both. I found the code is P1135 and P1155. Both are "A/F sensor heater circuit malfunction". I replaced B1S1 and B2S1 by Bosch 15217 wideband A/F sensors. However I still got P1135 and P1155.

Have any one used Bosch 15217 for ES300? Would you mind telling me if Bosch part can be compatible with 1999 ES300?

Thanks in advance

[herkitkat2222@verizon.net]

Hi

My car is 1999 ES300. Couple months ago, I got ECL and TRACOFF came up both. I found the code is P1135 and P1155. Both are "A/F sensor heater circuit malfunction". I replaced B1S1 and B2S1 by Bosch 15217 wideband A/F sensors. However I still got P1135 and P1155.

Have any one used Bosch 15217 for ES300? Would you mind telling me if Bosch part can be compatible with 1999 ES300?

Thanks in advance

[herkitkat2222@verizon.net]

Hi

My car is 1999 ES300. Couple months ago, I got ECL and TRACOFF came up both. I found the code is P1135 and P1155. Both are "A/F sensor heater circuit malfunction". I replaced B1S1 and B2S1 by Bosch 15217 wideband A/F sensors. However I still got P1135 and P1155.

Have any one used Bosch 15217 for ES300? Would you mind telling me if Bosch part can be compatible with 1999 ES300?

Thanks in advance

[lenore]

ON the RX forum Bosch is hit or miss, we recommend Denso....by the way sold on amazon for $100 or less....recently.,...

http://www.amazon.com/Denso-234-9009-Oxygen-Sensor-Ratio/dp/B000C5YCZ2/ref=sr_1_1?ie=UTF8&s=automotive&qid=1284579262&sr=8-1

[intakerGS]

You can try to measure the resistance of the heating element.

If it reads 8 ohms across the black wires, the resistance is above spec and the car will still generate a p1135 code. An original or replacement A/F sensor should read between .8 and 1.4 ohms. A bad element gives you an open circuit (you can try the original one).

There's also a possibility the wiring between the sensors and ecm is faulty. I'm not sure if it applies for the ES300, but sometimes there's a common harness for ground.

I've seen lot's of problems with Bosh A/F sensors versus Lexus/Toyota's, so best would be Denso/original.

[Camelot.King]

You can try to measure the resistance of the heating element.

If it reads 8 ohms across the black wires, the resistance is above spec and the car will still generate a p1135 code. An original or replacement A/F sensor should read between .8 and 1.4 ohms. A bad element gives you an open circuit (you can try the original one).

There's also a possibility the wiring between the sensors and ecm is faulty. I'm not sure if it applies for the ES300, but sometimes there's a common harness for ground.

I've seen lot's of problems with Bosh A/F sensors versus Lexus/Toyota's, so best would be Denso/original.

Hi

Thanks for your prompt response.

(1) I have measured Bosch 15217's heater resistance. it's 1.2ohm which meet specs

(2) I replaced the B1S1 with Denso 234-9009 (from Amazon, original box)

(3) keep B2S1 Bosch 15217.

Even I do these, I still get P1135 and P1155 both.

Some mechanic told me that the A/F sensor must come from dealer because it's very sensitive. Is this true?

[Camelot.King]

ON the RX forum Bosch is hit or miss, we recommend Denso....by the way sold on amazon for $100 or less....recently.,...

http://www.amazon.com/Denso-234-9009-Oxygen-Sensor-Ratio/dp/B000C5YCZ2/ref=sr_1_1?ie=UTF8&s=automotive&qid=1284579262&sr=8-1

Do you use parts from amazon? Are they OK? I also used the denso A/F sensor from amazon. The problem is still there.