I keep getting P1135 and P1155 Codes for reasons why my check engine light comes on.

Asked by Mar 27, 2017 at 07:08 PM about the 2001 Toyota Avalon XL

Question type: Maintenance & Repair

I recently went to get the Safety and Emissions test done and was
immediately FAILED because of a check engine light indicator. The Codes
that came back were P1135 and P1155 for Air/Fuel Ratio Sensor. I was told
by the NAPA Auto parts store to replace the rear sensor first (P1135) and
then clear and reset the check engine light because often that is the reason
for both codes being pulled. Changed the rear sensor, took it back, reset
the system and the light immediately came back on with both codes being
pulled.

The main question is could this be something else? I don't want to replace
both expensive sensors if that is not the real problem. What else could this
be? What can I do to fix the problem? Any help would greatly help.

2 Answers

74,725

You replaced the wrong O2 sensor....P1135 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1...Possible causes; Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection, Faulty Engine Control Module (ECM)...The P1135 is set when the Engine Control Module (ECM) detects a heated oxygen sensor heater circuit malfunction..........P1155 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1...Possible causes; Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open or shorted, Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection, Faulty Engine Control Module (ECM)...The P1155 is set when the Engine Control Module (ECM) detects a heated oxygen sensor heater circuit malfunction.

Do you have pictures of where these sensors are? Also how do I check to see if the circuit is open or shorted(bad electrical connection. OR if the Engine Control Module is bad?

Your Answer

Toyota Avalon Experts

  • #1
    Tom Demyan
    Reputation
    1,810
  • #2
    lilfrosty357
    Reputation
    920
  • #3
    dandyoun
    Reputation
    680
View All

Related Models For Sale

Used Toyota Camry
956 Great Deals out of 82,111 listings starting at $999
Used Honda Accord
1,033 Great Deals out of 59,784 listings starting at $1,099
Used Nissan Maxima
269 Great Deals out of 22,951 listings starting at $1,499
Used Toyota Highlander
468 Great Deals out of 31,221 listings starting at $2,500
Used Toyota Corolla
810 Great Deals out of 54,980 listings starting at $1,200
Used Nissan Altima
1,012 Great Deals out of 78,490 listings starting at $1,627
Used Toyota 4Runner
276 Great Deals out of 23,385 listings starting at $2,300
Used Toyota RAV4
722 Great Deals out of 46,748 listings starting at $1,195
Used Chevrolet Impala
536 Great Deals out of 35,319 listings starting at $900
Used Honda Civic
786 Great Deals out of 70,338 listings starting at $1,499

Used Cars For Sale

2018 Toyota Avalon For Sale
9,168 listings starting at $28,568
2017 Toyota Avalon For Sale
8 Great Deals out of 1,133 listings starting at $21,999
2016 Toyota Avalon For Sale
13 Great Deals out of 799 listings starting at $15,991
2015 Toyota Avalon For Sale
34 Great Deals out of 811 listings starting at $12,995
2014 Toyota Avalon For Sale
60 Great Deals out of 1,233 listings starting at $13,708

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.