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

73,035

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
    1,780
  • #2
    lilfrosty357
    Reputation
    900
  • #3
    dandyoun
    Reputation
    680
View All

Related Models For Sale

Used Toyota Camry
43 Great Deals out of 1,599 listings starting at $1,700
Used Honda Accord
67 Great Deals out of 1,127 listings starting at $748
Used Toyota Highlander
23 Great Deals out of 595 listings starting at $2,900
Used Toyota Corolla
153 Great Deals out of 3,430 listings starting at $2,500
Used Nissan Maxima
29 Great Deals out of 332 listings starting at $3,976
Used Toyota RAV4
62 Great Deals out of 2,878 listings starting at $2,999
Used Nissan Altima
65 Great Deals out of 1,275 listings starting at $2,750
Used Toyota 4Runner
7 Great Deals out of 429 listings starting at $5,995
Used Honda Civic
297 Great Deals out of 4,193 listings starting at $1,291
Used Chevrolet Impala
58 Great Deals out of 930 listings starting at $1,900
Used Hyundai Sonata
43 Great Deals out of 1,308 listings starting at $1,781

Used Cars For Sale

2018 Toyota Avalon For Sale
18 listings starting at $42,389
2017 Toyota Avalon For Sale
21 listings starting at $35,716
2016 Toyota Avalon For Sale
15 listings starting at $33,280
2015 Toyota Avalon For Sale
11 listings starting at $28,950
2014 Toyota Avalon For Sale
17 listings starting at $23,995

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.