Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Exhaust System Back Pressure Test Tool (04 12 00)
Reference number: 04 12 00
EXHAUST SYSTEM BACK PRESSURE TEST TOOL
TECHNICAL SERVICE BULLETIN
| BMW: | All Models |
| GROUP: | 04 - Tools and Equipment |
SUBJECT
Exhaust System Back Pressure Test Tool
SITUATION
Distribution of the following tool will be through the Automatic Tool Shipment Program. Additional tools may be purchased through your PDC.
TOOL INFORMATION
Exhaust System Back Pressure Test Tool P/N 99 00 0 001 855
Used to check exhaust system for excessive back pressure in regards to customer complaint of engine has no power or check engine lamp illuminated (FC 40, 45, 233 and/or 63 74. Refer to SIB 18 02 99 and repair manual section 11 78 for complete details. Attached to this bulletin are test instructions. Identical instructions are included with each tool.
The exhaust back pressure tool consists of:
- 1. Analog gauge
- 2. Connecting hose
- 3. Connecting fitting for oxygen sensor hole
TOOL WARRANTY
Refer to Pats Information bulletin 01 01 95 for tool warranty details.
EXHAUST BACK PRESSURE TEST INSTRUCTIONS
PROCEDURE
If the above customer complaints are received and a restricted catalytic converter is suspected:
- Remove the pre-catalytic converter oxygen sensor as outlined in the appropriate repair manual, group 11 section 11 78.
- Install the exhaust back pressure gauge hose connector in place of the pre-catalytic converter oxygen sensor. See Fig 2
.NOTE: Lightly tighten (snug) the tool fitting. Do not over tighten.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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