Some 2008-2009 Toyota Camry HV vehicles may exhibit a MIL on condition with one of the following DTCs:
- P2238….Oxygen (A/F) sensor pumping current circuit low (Bank 1 Sensor 1)
- P2237….Oxygen (A/F) sensor pumping current circuit open (Bank 1 Sensor 1)
An improved engine wiring harness has been developed to address this condition.
This TSB applies to vehicles produced before the production change effective VINs shown here:
MODEL PLANT PRODUCTION CHANGE EFFECTIVE VIN
Camry HV TMMK 4T1BB46K#9U080445
PREVIOUS P/N CURRENT P/N PART NAME QTY
82121-33B51 same wire, engine 1
82121-06b70 same wire, engine 1
17177-0H010 same gasket, intake man. To head No. 1 1
00272-SLLC2 Toyota Super Long Life Coolant 3.1 qts
TIS Techstream and software version 3.01.000 or later
Safety gloves 00002-03100-S (small), 00002-03200-M (medium), 00002-03300-L (large).
- Using TIS Techstream, check for stored DTCs.
- Verify that DTC(s) P2238 and or P2237 are present. If other A/F sensor DTCs are present this TSB does not apply. Follow Repair Manual procedures to diagnose those DTCs.
- Follow Repair Manual procedure to inspect the A/F sensor heater and Engine Room Junction Block (A/F Relay).
- If the A/F sensor heater and Engine Room Junction Block (A/F relay) are within Repair Manual specifications, replace the engine wire harness. It is necessary to remove the intake manifold and inverter assembly to access the engine wire harness. Note that this is a hybrid vehicle and that high voltage is present. Wear the proper safety gear and follow specific Toyota Repair Manual procedures. Only technicians that have Toyota hybrid training should attempt this work.
- After engine wire harness replacement, clear DTCs and verify that no DTCs are reset. Then warm the engine to operating temperature and test drive to verify the repair.