Page 7 of 11

Step 7b) Open the valve on the applicator tool carefully and adjust to approximately
22 degrees from closed. Use the illustration below for reference. At that flow rate, it
should take about 1 hour to empty the 6.76 oz. bottle. IMPORTANT: This flow rate is
critical. Some trial and error (e.g. put the intake supply hose into a CLEAN container and
experiment as needed to determine the proper opening position of the valve to achieve the
required flow rate). Return any used P.E.A. to the supply bottle.

Step 7c) When the bottle has been emptied, return the engine speed to idle, allow to idle for
a few moments then switch the ignition OFF.
Step 7d) Close the valve, remove the tool from the purge hose connection and reconnect
the purge hose.
•

STEP 8: Burning of Carbon Deposits Off the Spark Plugs:
Step 8a) Start the engine, warm it up until the radiator fan cycles on then return the engine
speed to idle.
Step 8b) Raise the engine speed to 3500 rpm, hold it there for 25 seconds then return it to
idle for 5 seconds. Repeat this cycle 5 times then keep it at idle for 30 seconds to allow the
engine to cool down. Repeat the above procedure 2 more times (3 times total).
REMINDER: To avoid overheating, keep the engine hood open. The use of a supplemental
cooling fan to circulate air and cool the engine compartment is recommended.

•

STEP 9: Verification of Cleaning Status: Follow A) or B) below depending on the engine
type:
A) FOR NON-HYBRID NATURALLY ASPIRATED ENGINES (DINA) MODELS
ONLY:
Step 9a) Read the Roughness Counter again referencing Step 2 above for the procedure.
Step 9b) Verify the results of the cleaning procedure by confirming the condition below:
•

Has the Roughness Counter total value become less than 34?
If YES (successful), proceed to Step 10.
Continued...

Bulletin Number: 09-74-21R; Revised: 06/25/26

Page 8 of 11

B) FOR ALL MODELS OTHER NON-HYBRID NATURALLY ASPIRATED ENGINES:
Step 9a) Verify the cleaning procedure results by confirming the 2 conditions below:
•

Has the rough idle condition smoothed out?

•

Have the other conditions confirmed before cleaning been successfully addressed
including: engine misfire DTCs, black smoke from the exhaust, lack of power,
and/or knocking (ping)?

Step 9b) If the answers to the above questions (9a / 9b) are YES (successful), proceed to

Step 10.
If one or more answers to the questions above is NO (NOT successful), return to Step 4 and repeat
the P.E.A. cleaning process. If the conditions above are not satisfied after the second attempt,
CHANGE THE ENGINE OIL (no filter change) and perform a third attempt. If a fourth attempt is
required and the result is still unsuccessful, CHANGE THE ENGINE OIL AGAIN (no filter change)
and follow the SOA Escalation Process for additional support.
IMPORTANT: In a case where more than one cleaning attempt is required, it is STRONGLY
recommended to change the engine oil (oil only, no filter change) after every 2 bottles of P.E.A. are
consumed by the engine. Do NOT add more P.E.A. to the fuel tank.
•

STEP 10: Confirmation Road Test
Step 10a) Clear the ECM memory and road test the vehicle to confirm the Check Engine
light does not come back on to complete the procedure.
VERY IMPORTANT: When returning the vehicle to the customer, always advise to NOT
refill the fuel tank until the gauge reads BELOW 1/4 full. This will maximize the effect of the
P.E.A. poured into the fuel tank in Step 3.

WARRANTY / CLAIM INFORMATION:
For vehicles within the Basic New Car Limited or Powertrain Limited Warranty period, this repair
may be submitted using the following claim information:
IMPORTANT NOTES:
•

In a case where multiple cleaning attempts are required, it is STRONGLY recommended to
change the engine oil after every 2 bottles of P.E.A. are consumed by the engine (oil only, no
filter).

•

The claimable Warranty Part Number for 1 (one) bottle of the P.E.A. cleaner is SOA635328.

Continued...
Bulletin Number: 09-74-21R; Revised: 06/25/26

Page 9 of 11

TESTING / REPAIR OUTCOMES and CLAIM CODING INFORMATION
TEST DRIVE, DTC CHECK, SPARK PLUG,
IGNITION COIL AND INTAKE MANIFOLD
INSPECTIONS (TURBO AND NA
MODELS), P.E.A. CLEANING PROCEDURE
NOT REQUIRED

A449-208

Fail Code

2.7

DGR-85

**NOTE: In cases where more than one (1) P.E.A. cleaning procedure is claimed, SSM4 data will
be required.
Model Applicability
DIT (TURBO) and SHEV MODELS ONLY
P.E.A. CLEANING PROCEDURE REQUIRED

Ascent, Leg / Obk,
Forester SHEV,
Crosstrek SHEV

WRX, Forester XT

Fail Codes

INTAKE MANIFOLD R&R & CLEAN, 1
TREATMENT REQUIRED

A449-211

5.6

5.3

DGN-42

INTAKE MANIFOLD R&R & CLEAN, 2
TREATMENTS REQUIRED AND 1 ENGINE
OIL CHANGE

A449-212**

7.6

7.3

DGO-42

INTAKE MANIFOLD R&R & CLEAN, 3
TREATMENTS REQUIRED AND 1 ENGINE
OIL CHANGE

A449-213**

9.3

9.0

DGP-42

INTAKE MANIFOLD R&R & CLEAN, 4
TREATMENTS REQUIRED AND 2 ENGINE
OIL CHANGES

A449-214**

11.3

11.0

DGQ-42

DINA (N/A) MODELS ONLY
P.E.A. CLEANING PROCEDURE REQUIRED

Model Applicability
Fail Codes

Crosstrek Sport, Impreza / Crosstrek
Leg / Obk, Forester
2.0 DINA

INTAKE MANIFOLD R&R & CLEAN, 1
TREATMENT REQUIRED

A449-201

7.1

6.9

DGN-42

INTAKE MANIFOLD R&R & CLEAN, 2
TREATMENTS REQUIRED AND 1 ENGINE
OIL CHANGE

A449-202

9.6

9.4

DGO-42

INTAKE MANIFOLD R&R & CLEAN, 3
TREATMENTS REQUIRED AND 1 ENGINE
OIL CHANGE

A449-203

12.1

11.9

DGP-42

INTAKE MANIFOLD R&R & CLEAN, 4
TREATMENTS REQUIRED AND 2 ENGINE
OIL CHANGES

A449-204

14.9

14.7

DGQ-42

Note: For SHEV models perform the procedure when engine and inverter coolant is not drained.
IMPORTANT REMINDERS:
•

SOA strongly discourages the printing and/or local storage of service information as previously
released information and electronic publications may be updated at any time.

•

Always check for any open recalls or campaigns anytime a vehicle is in for servicing.

•

Always refer to STIS for the latest service information before performing any repairs.
Continued...

Bulletin Number: 09-74-21R; Revised: 06/25/26

Page 10 of 11

Appendix A: Service Procedure Flow Chart
DI (NA) or DIT (Turbo)
engine is operating
erratically

Any DTC(s) other
than P030X?

Any DTC(s) other
than P030X?

Confirmation road test,
Drive Cycle A or B

NO

YES

YES

Diagnose other DTC(s) following
applicable Service Manual.

2.5L DINA engine
with P030X?

YES

YES

Read Roughness
Counter (2.5L DINA
ONLY) and record
results.

NO

Diagnose other DTC(s) following
applicable Service Manual.

Remove intake manifold assembly and
inspect for carbon, soot or deposits inside
it and / or on the intake valves. Were any
deposits verified?

Check all spark plugs and
ignition coils per Service
Manual procedures.

NO

Diagnose following applicable
Service Manual.

Perform P.E.A. Cleaning
Procedure starting with
Step 3.

Perform burning of carbon deposits from the spark
plugs procedure (Step 8). NOTE: NOT necessary
when additional P.E.A. applications are required.

Install the cleaning tool
with 1 full bottle of P.E.A.
to the intake manifold
Steps 4-6.

Add 1 full bottle of
P.E.A to the fuel tank
(Step 3).

Confirm the fuel
tank is FULL

Begin application of PEA into
intake manifold (Step 7).

Remove the cleaning tool.

Change the engine oil
after the SECOND and
FOURTH P.E.A.
application.

Has the symptom (rough idle, etc.) been eliminated?
If NO, (on 2.5L DINA w/ P030X ONLY) has the
Roughness Counter number decreased to below 34?
NO

YES

Successful after
after SECOND, THIRD or FOURTH
P.E.A. application?

Perform confirmation road test,
Drive Cycle A or B.

YES

NO

Free of any DTC(s)?

NO

Follow SOA Escalation
Process.

YES

COMPLETE. Return vehicle to the customer.

Continued...
Bulletin Number: 09-74-21R; Revised: 06/25/26

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