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Skyvisions
Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14355
Experience:  Toyota Master Diagnostic
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1998 Toyota Avalon. Dealer found Codes P0125 and 1155 and

Customer Question

1998 Toyota Avalon. Dealer found Codes P0125 and 1155 and replaced AF sensor 89467-41011. Two months later the check engine light is back on; just checked the codes and found P0171 and P0171 P and P1130 P. Is it related or something new? What is the fix? Thanks.
Submitted: 3 months ago.
Category: Toyota
Expert:  Skyvisions replied 3 months ago.

Do you have the VIN available?

Customer: replied 2 months ago.
1998 Toyota Avalon. Dealer found Codes P0125 and 1155 and replaced AF sensor 89467-41011. Two months later the check engine light is back on; just checked the codes and found P0171 and P0171 P and P1130 P. Is it related or something new? What is the fix? Thanks. VIN 4T1BF18B4XU318396
Expert:  Skyvisions replied 2 months ago.

Unfortunately these are not related. It is a similar problem however. The first time you are in the 1155 code indicated a heater circuit in the bank 2 or the front sensor in the front manifold by the radiator. Because the heater was not working in the sensor itself in then by default triggers the P0125 code because the sensor is not becoming active fast enough for the coolant temperature rating. The codes you have now indicate that the system is running lean in actuality that P1130 code means that the air fuel ratio sensor performance is not up to par or out of standard spec. 99% of the time this means the air fuel ratio sensor for bank one is in the manifold back by the firewall will have to be replaced. There is a remote chance that the P0171 code which is a lean condition code could be causing a false P1130 code you would need to make sure there are no intake leaks anywhere along the intake runner tube that is ruled out then it is a bad AFR sensor.

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