Toyota Repair: codes p0031, p2238, air fuel ratio, camry v6

Question
QUESTION: 2003 Camry v6 with trouble codes p0031, p2238 at 65,000 miles. Originally only code p2238 appeared which I erased.
O.K. for approximately 4 miles. On return trip both codes p0013, p2238 were set and now reappear immediatley after erasing. Have made no attempts at repair so far.

ANSWER: Toyota had issued a service bulletin for this condition> Title:
M.I.L. ON" DTC P0031, P0051, P2238
OR P2241
Models:
’03 Camry (V6)
Technical Service
BULLETIN
October 28, 2003
Under certain driving conditions, some 2003 model year Camry vehicles with V6 engines
may exhibit a M.I.L. “ON” with at least one of the following DTCs as a result of an Air Fuel
(A/F) Sensor manufacturing issue.
�� P0031 (Oxygen Sensor Heater Control Circuit Low [Bank 1, Sensor 1])
�� P0051 (Oxygen Sensor Heater Control Circuit Low [Bank 2, Sensor 1])
�� P2238 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor)
[Bank 1, Sensor 1])
�� P2241 (Oxygen Sensor Pumping Current Circuit Low (for A/F Sensor)
[Bank 2, Sensor 1])
Replacement of the affected Air Fuel Sensor will correct this condition.
�� 2003 model year Camry vehicles equipped with V6 engines produced BEFORE the
Production Change Effective VINs shown below.
PLANT PRODUCTION CHANGE EFFECTIVE VIN
Tsutsumi JTDBF3#K*30147085
TMMK
Line 1 4T1BF3#K*3U058917
Line 2 4T1BF3#K*3U565065
PREVIOUS PART NUMBER CURRENT PART NUMBER PART NAME
89467–33060 Same Sensor, Air Fuel Ratio Bank 1
89467–33050 Same Sensor, Air Fuel Ratio Bank 2
OP CODE DESCRIPTION TIME OFP T1 T2
895131 R & R A/F Sensor 0.6 89467–33050 or
95 71
Combo A Opposite Side 0.1
89467–33060
Applicable Warranty*:
This repair is covered under the Toyota Comprehensive Warranty. This warranty is
in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’s
in-service date.
* Warranty application is limited to correction of a problem based upon a customer’s specific complaint.

---------- FOLLOW-UP ----------

QUESTION: Before replacing O2 sensor, replaced bank1 spark plugs necessitating removal of air plenum, throttle body, etc. (Bank 2 plugs were changed previously).

Next replaced O2 (upstream) sensor1, bank1.
Cleared codes P0031,P2338. Drove car ~75 miles with no problems.
Codes did not reset.

All sensors now show ready, except evap which shows incomplete on scanner.

However, next day (after 75 mile trip), trac off and VSC lights came on after starting and moving the car. Do not see any unconnected electrical plugs or hoses. Hose routing appears to be correct.

Trac off and VSC lights now always on after starting and moving car.

Answer
Trac/Vsc lights on without the check engine light on are specific to those systems, can you check for DTCs in those systems and let me know what they are? This model does not monitor TRAC/VSC systems, since the lights come on right after satarting there may be an open circuit from one of the sensors or possibly the deceleration/yaw rate sensor calibration is undone and needs to be recalibrated, this may happen after the check engine light has been on and then cleared.