I took 2002 toyota camry xle a week back and found two error codes is diplaying i.e p1135 and p1155 after fixing new sensors on that still we are getting those codes. Please help me what might be the issue?

Then it is time to consult an expert local shop. As you have learned no doubt that throwing parts at the problem gains you nothing.

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.

code p1155 refers to heated oxygen sensor(HOS)-RH front heater circuit malfunction==causes -wiring--HO2S-- ECM. Replace the oxygen sensor.
Code p1135 refers to heated oxygen sensor(HO2S) -LH front-heater circuit malfunction==causes --wiring--HO2S--air induction system--fuel pressure--injectors--ECM replace the o2 sensor and have a pressure test done on the fuel manifold to check for pump/regulator/ filter problems.

Air flow Sensor

PER "http://www.obd-codes.com/trouble_codes/toyota/" P1135 =
Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)

no you need an a/f sensor if the code is for a bank one it is located on the exhaust manifold on the back of the engine compartment vise versa if it is for bank 2

Not sure where you got that definition for that code but this is what it is and means with possible causes for whichever motor you have:

Trouble Code: P1135 (2.4L L4 VIN - Auto)
A/F Sensor-11 (Bank 1 Sensor 1) Heater Circuit Malfunction Print this code data
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details

• CCM Details
• MIL Details

Trouble Code Conditions:
Engine started, engine running, and the PCM detected the A/F Sensor-11 (A/FS-11) heater current was less than 0.25A, or that it was more than 8.0A at anytime during the CCM test.

Possible Causes:

• A/F sensor heater circuit or ground circuit is open
  
• A/F sensor heater power circuit is open
  
• A/F sensor heater is damaged or has failed
  
• PCM has failed
  

2001 Toyota Highlander - I4 - P1135, P1155


Trouble Code: P1135 (3.0L V6 VIN - Auto)
A/F Sensor-11 (Bank 1 Sensor 1) Heater Circuit Malfunction Print this code data
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details

• CCM Details
• MIL Details

Trouble Code Conditions:
Engine started, engine running, and the PCM detected the A/F Sensor-11 (A/FS-11) heater current was less than 0.25A, or that it was more than 8.0A at anytime during the CCM test.

Possible Causes:

• A/F sensor heater circuit or ground circuit is open
  
• A/F sensor heater power circuit is open
  
• A/F sensor heater is damaged or has failed
  
• PCM has failed
  

2001 Toyota Highlander - V6 - P1135

2002 CAMRY MY ENGINE LIGHT CAME ON - THE DEALERSHIP SAID IT WAS A PO171,P1130,P1135 DO I HAVE TO GET IT FIX. 448.00 IT WILL COST

Here's what the codes mean:
P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1)
P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2

This is mainly related to the oxygen sensors. It maybe the sensors themselves or an open wire going to te sensors. They are mainly located on the exhaust pipe. One before and on after the catalytic converter.

CHECK AIR FUEL RATIO SENSOR HEATER RELAY