P1135 Toyota -

Question

2002 Toyo Camry V-6; approximately 193K-Recently replaced: 6 Spark Plugs (OE)/6 ignition coils/valve cover gaskets/gaskets for intake plenum & EGR (2) After the work was finished the check eng light came on, the codes are P1135 & P1155; indicating a fault with the heater circuit of both F&R A/F sensors. Since then I have carefully re-inspected the area I worked, looking for a visible mistake and found none. I have also used propane to verify that no vacuum leaks exist. The car starts & runs just great; with a steady idle. I disconnected the front A/F sensor and with my DVOM set on it's lowest resistance, got 3.3 Ohms between the 2 BLK wires (I subtracted the 0.5 shown when the leads are touched) At the connector from the ECM, with the key on, I have 12 VDC (which would eliminate both the 25 amp fuse & the relay as faulty; right?) I also tested for continuity. (Even though I knew it would have continuity with resistance) The rear bank is tough to access for testing. I'm out of ideas and think my next step is to replace only the front A/F sensor, clear codes and see if the P1135 code (Front Bank) returns-If it doesn't, then replace the rear A/F sensor. Comments/suggestions Have I done all of the steps to insure that the fault is NOT wiring or ECM?

Answer 1

P1135 A/F sensor heater circuit malfunction Bank 1 Sensor 1

This is strictly with the A/F sensor of Bank 1 Sensor 1, as for the location this is the one at the back area of the engine, If you use a scan tool to see what the 02 sensor is doing this would be better proof that the heater element of the 02 sensor is non operational

​The location Bank 1 Sensor 1

 

​ The location

​ Using a scan tool with a graphing the 02 sensor would look like this , this would set a heater element code

​ The 02 sensor after the replacement