T-SB-0104-21

T-SB-0104-21
December 17, 2021
MIL ON with Low Oil Pressure DTCs P05202A and/or
P052477 and Milky/Discolored Engine Oil in Freezing
Temperatures
Service
Category
Engine/Hybrid System
Section
Lubrication
Market USA
Fini
Applicability
YEAR(S)
MODEL(S)
2019 - 2022
Avalon HV, Corolla
Hatchback, RAV4, RAV4 HV
2021 - 2022
Avalon
2018 - 2022
Camry HV
2018 - 2022
Camry
2022
Corolla Cross
2020 - 2022
Corolla
2020 - 2022
Highlander HV
2021 - 2022
RAV4 Prime, Sienna HV,
Venza HV
ADDITIONAL INFORMATION
VDS(s): KB1BB, LB1BB, MB1BB, NB1BB
Engine(s): A25
VDS(s): A11AK, B11HK, B61HK, BF1FK,
BZ1HK, C11AK, C11BK, C31AK, E11AK,
E11BK, E31AK, F11AK, F11BK, G11AK,
G11BK, H11AK, H11BK, J11AK, J11BK, K31AK,
K61AK, K61BK, L11AK, L11BK, M11AK,
M11BK, NZ1AK, PZ1AK, R11AK, R11BK,
S11AK, S11BK, T11AK, T11BK
Engine(s): A25
VDS(s): B4MBE, B4RBE, M4MCE, M4RCE,
P4MCE, P4RCE, S4MCE, S4RCE, T4MCE,
T4RCE
Engine(s): M20
© 2021 Toyota Motor Sales, USA
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T-SB-0104-21
December 17, 2021
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MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Introduction
Some 2018 – 2022 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, or
M20A-FKS engine may exhibit one or more of the following conditions:

Milky/Discolored engine oil.

An “Oil Pressure Low” warning message on the Multi-information Display (MID).

A MIL ON condition with Diagnostic Trouble Codes (DTCs) P05202A (Engine Oil Pressure
Sensor/Switch "A" Signal Stuck in Range) and/or P052477 (Engine Oil Pressure too
low [Severe]).
Moisture from blow-by gases condenses and accumulates in the engine oil during short trips in
extreme cold weather. When the moisture in the oil freezes, the oil pressure may drop, and the
aforementioned warning indicators may display. Follow the procedures in this bulletin to address
these conditions.
Figure 1. Engine Oil (Normal Appearance)
Figure 2. Engine Oil (Milky/Discolored)
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
N/A
Not Applicable to Warranty
–
–
–
–
Parts Information
PART NUMBER
PART NAME
QTY
90915-YZZN1
Oil Filter
1
90430-12031
Gasket (For Oil Pan Drain Plug)
1
© 2021 Toyota Motor Sales, USA
T-SB-0104-21
December 17, 2021
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MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Required Tools & Equipment
REQUIRED TOOLS & MATERIAL
ENGINE
QUANTITY
Clean Shop Towel
–
1
A25
4.8 qts.
M20
4.9 qts.
API SN/RC Multigrade Engine Oil (SAE 0W-16)
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVI*
PART NUMBER
QTY
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
 Only ONE of the Techstream units listed above is required.
 Software version 16.20.027 or later is required.
 Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
Confirmation Procedure
NOTE
If any internal coolant system leaks are present, coolant can mix with oil and create a similar
milky/discolored appearance. Be sure to address any cooling system leaks BEFORE proceeding.
1. Check the appearance of the engine oil on the oil level gauge (dip stick).
NOTE
The oil should be transparent with a brown or amber color.
Does the engine oil have a milky/discolored appearance as shown in Figure 2?

YES — Continue to step 2.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2021 Toyota Motor Sales, USA
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December 17, 2021
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MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Confirmation Procedure (continued)
2. Perform a cooling system pressure check to test for any internal coolant leaks.
Refer to TIS, applicable model and model year Repair Manual:

2019 – 2022 Avalon HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2019 – 2022 Corolla Hatchback:
Engine/Hybrid System – “M20A-FKS (Cooling): Cooling System: On-Vehicle Inspection”

2019 – 2022 RAV4:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2019 – 2022 RAV4 HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2021 – 2022 Avalon:
Engine/Hybrid System – “A25A-FKS (Cooling): Cooling System: On-Vehicle Inspection”

2018 – 2022 Camry HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2018 – 2022 Camry:
Engine/Hybrid System – “2GR-FKS (Cooling): Cooling System: On-Vehicle Inspection”

2022 Corolla Cross:
Engine/Hybrid System – “M20A-FKS (Cooling): Cooling System: On-Vehicle Inspection”

2022 Highlander HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2021 – 2022 RAV4 Prime:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2021 – 2022 Sienna HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”

2021 – 2022 Venza HV:
Engine/Hybrid System – “A25A-FXS (Cooling): Cooling System: On-Vehicle Inspection”
Did the cooling system hold pressure?

YES — Continue to step 3.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
3. Is an “Oil Pressure Low” warning displayed on the MID and/or are DTCs P05202A and/or
P052477 present?

YES — Go to Repair Procedure 1.

NO — Go to Repair Procedure 2 to ONLY address the milky/discolored oil condition.
© 2021 Toyota Motor Sales, USA
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MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Repair Procedure 1
1. Using Techstream, clear ANY DTCs.
2. Start the engine.
A. Use maintenance mode for hybrid models.
Refer to TIS, applicable model and model year Repair Manual:
 2019 – 2022 Avalon HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2019 – 2022 RAV4 HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2018 – 2022 Camry HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2020 – 2022 Highlander HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 RAV4 Prime:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 Sienna HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 Venza HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
B. Allow the engine to idle until the engine coolant temperature reaches 122°F.
C. Did the “Oil Pressure Low” warning display or did DTC(s) P05202A and/or
P052477 return?
 YES — Continue to step 3.
 NO — Go to Repair Procedure 2.
3. Replace the engine oil and oil filter.
4. Using Techstream, clear ANY DTCs.
© 2021 Toyota Motor Sales, USA
T-SB-0104-21
December 17, 2021
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MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Repair Procedure 1 (continued)
5. Start the engine.
A. Use maintenance mode for hybrid models.
Refer to TIS, applicable model and model year Repair Manual:
 2019 – 2022 Avalon HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2019 – 2022 RAV4 HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2018 – 2022 Camry HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2020 – 2022 Highlander HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 RAV4 Prime:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 Sienna HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
 2021 – 2022 Venza HV:
General – Introduction – “Introduction: Repair Instruction: Inspection Mode Procedure”
B. Allow the engine to idle until the engine coolant temperature reaches 122°F.
C. Did the “Oil Pressure Low” warning display or did DTC(s) P05202A and/or
P052477 return?
 YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
 NO — Continue to step 6.
6. Turn OFF the engine.
7. Remove and inspect the oil filler cap.
Figure 3.
A. Check for ANY milky/discolored residue
on the underside of the filler cap
as shown.
B. Wipe off ANY milky/discolored residue
with a clean shop towel.
8. Reinstall the oil filler cap.
9. Confirm the engine oil on the oil level gauge
(dip stick) no longer has a
milky/discolored appearance.
© 2021 Toyota Motor Sales, USA
T-SB-0104-21
December 17, 2021
MIL ON with Low Oil Pressure DTCs P05202A and/or P052477 and
Milky/Discolored Engine Oil in Freezing Temperatures
Repair Procedure 2
1. Replace the engine oil and oil filter.
2. Remove and inspect the oil filler cap.
Figure 4.
A. Check for ANY milky/discolored residue
on the underside of the filler cap
as shown.
B. Wipe off ANY milky/discolored residue
with a clean shop towel.
3. Reinstall the oil filler cap.
4. Confirm the engine oil on the oil level gauge
(dip stick) no longer has a
milky/discolored appearance.
© 2021 Toyota Motor Sales, USA
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