P1155 code changed the 02 sensors two times and still get code P1155 , its getting to cost me big bucks , and still get the code ?

P1155 Air/Fuel sensor Heater Circuit Bank1 sensor 1
DON'T just throw a new oxygen sensor at this. First check the electrical connector to see if you're getting power for the sensor heater. It may just be a blown fuse. If the power is good, THEN buy a new sensor. Stick with NGK or DENSO brands. The others won't work well.

Most likely not, they look the same but the plastic shell has a ridge coded into it that prevents hooking it up to the wrong sensor. I think you may have an issue with the O2 heater circuit, loss of ground or power.

Replace the 02 sensors. 2 of the codes are 02 sensor malfunctions and 2 codes are because the system is too lean in both banks 1 and 2.

http://www.tundrasolutions.com/forums/avalon/70953-2002-avalon-o2-sensor-p1155-code/

did you replace the oxygen sensor?

CODE P1155 HEATED OXYGEN SENSOR RIGHT HAND FRONT HEATER CIRCUIT MALFUNCTION.

P1155 Air/Fuel Sensor Heater Circuit. (Bank 2 Sensor 1)

Actually P1155 is pointing to a fault with the internal heater for the A/F Sensor (aka Oxygen Sensor) for Bank 2 Sensor 1. The PCM uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Replacing this sensor should solve your problem. This sensor is located in the front exhaust manifold.

Hope helps (remember rated this).

All cars sold in the US after 1995 use the same on board diagnotics called OBD-II. The codes are the same. Search OBM-II error codes and you'll get a listing.

P1150 Air/Fuel Sensor Circuit Range/Performance. (cylinder bank 1 Sensor 2)

P1150 may mean that one or more of the following has happened:
water or corrosion in the O2 sensor connector, loose terminals in the connector, wiring burnt on exhaust components, open or short in the wiring due to rubbing on engine components, holes in exhaust allowing unmetered oxygen into exhaust system, unmetered vacuum leak at the engine, bad O2 sensor or bad PCM.

P1155 Air/Fuel Sensor Heater Circuit. (cylinder bank 1 Sensor 2)
P1155 may mean that one or more of the following has happened: O2 Heater element resistance is high, Internal short or open in the heater element or O2 heater circuit wiring high resistance

Solution :Replace oxygen sensor and see if the problem goes away.

The upper sensors are air fuel sensors and the lower ones are o2 sensors. you cant mix these up. Assuming you did everything right and still coding then either the new sensor b1s2 is bad or the wirng(power and ground need to be checked. A scan tool can be used to look at the performance of the sensors too. Sometimes the codes just point to the area of the problem and changing the part isn't the answer.

thanks