99 Es300 P1139 Which A/f Sensor To Replace?

[mlgbwk]

Hi, need some help P1133 (typo in title) code on 99 es300.

CEL and TRAC OFF light on, code read P1139 (not p1135), mechanics told me it is the A/F sensor between the firewall and engine, bank 1 sensor, not the one between radiator and engine.

However I found this "FRONT-RIGHT" and FRONT-LEFT A/F sensor on amazon:

http://www.amazon.com/Denso-234-9009-Oxygen-Sensor-Ratio/dp/B000C5YCZ2/ref=au_pf_pfg_s?ie=UTF8&Model=ES300|997&n=15684181&s=automotive&Make=Lexus|75&Year=1999|1999&newCar=1&carId=005

http://www.amazon.com/Denso-234-9007-Oxygen-Sensor-Ratio/dp/B000C5WCY0/ref=cm_cr_pr_product_top

- what is the different between denso 234-9007 and 234-9009?

- which exactly sensor shall I replace for code p1139 for 99 es300?

Thanks!

m