Rbeeber

Hi. This is my first time posting here. I hope I'm in the right place. I had a P1135 code on my 1999 ES300. We replaced the A/F Sensor Bank1 Sensor1. Now I am getting a P1133 Code After about 30 miles. I believe that is pointing to the same sensor we just changed, Bank 1 Sensor1. We hooked up the scanner to check voltages. Bank2 Sensor1 is pushing between 3.2v and 3.3v at idle and revving. Bank1 Sensor1, the one just changed, is fluctuating constantly between 0.9v and 4.2v. Does that mean the A/F Sensor that was just changed is defective, or can something else be causing the erratic voltage fluctuation of that sensor. I hope someone can help me with this problem. I haven't been able to get the car inspected because of this. Thanks in advance for your help.

LeX2K

What brand sensor?

Rbeeber

Hi. Thanks for getting back to me. I used a Toyota sensor. #89467-48011

LeX2K

Check for wire damage another thing you could do is try swapping sensors front to back.

Rbeeber

I'll check the wires and try the swap tomorrow. Is bank1 sensor1 and bank 2 sensor1 the same? I noticed they have different part numbers, or is it just a difference in the wire length? Thanks again.

LeX2K

Same sensor different length wire you can get specs by searching here.
http://densoautoparts.com/find-my-part.aspx

fortitude

Reference data for '02 ES300.

AIR FUEL RATIO SENSOR
(a) Measure the resistance between terminals HT and +B.
Standard: 2.16 − 2.88 Ω at 20°C (68°F)

(b) Measure the resistance between terminals HT and E1.
Standard: 1 MΩ or more


What do your short & long term fuel trims look like?

tomf

No disrespect intended. Are you sure you replaced the correct sensor? The one by the firewall.

Rbeeber

Hi Tomf. Yes, we changed the one by the firewall. A bit tough to get to, but yes. Thanks.
Hi Fortitude. I'm new to this. I'm not sure which terminals are which. Hopefully my friend does. I'll find out when I see him later. Possibly a photo of the terminals? Thank you.

LeX2K

They are shown in his attached pdf here's the pinouts in case you can't open the file for some reason.

yeskay

e-bay has lot of knock off sensors with oem label and part numbers that fails too fast and throws other errors. did you buy it from a reputed store ?