BMW 135is Throttle Body Replacement at your home or office.

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Throttle Body Replacement Estimate for BMW 135is

BMW 135is Throttle Body Replacement costs $649 on average.

CarServiceEstimateShop/Dealer Price
2013 BMW 135isL6-3.0L TurboService typeThrottle Body ReplacementEstimate$1178.41Shop/Dealer Price$1472.13 - $2288.34
Show example BMW 135is Throttle Body Replacement prices

Throttle Body Replacement Service

What is the throttle body and how does it work?

The throttle body is an air metering device mounted between the air filter and snorkel, and the intake plenum. Within the throttle body is a movable throttle plate whose position controls the amount of air that enters the engine to determine engine speed. Throttle body designs vary. Some incorporate an idle air control valve, throttle position sensor, and other electronic throttle controls. The throttle plate in the throttle body can be controlled directly by an accelerator pedal cable or fully electronically in the newest drive-by-wire systems.

When to consider replacing the throttle body:

  • Check engine light and/or reduced power warning light is on. Most modern throttle bodies have electrical components, such as a throttle position sensor. These components are monitored by the powertrain control module (PCM). If the check engine light or reduced power warning light comes on, a mechanic will determine if any of the stored trouble codes implicate a throttle body malfunction.
  • Wrong idle speed. Carbon deposits in the throttle body, particularly around the movable throttle plate or in the idle air control valve, can cause the engine idle speed to be too low or too high.
  • Poor transmission shifting. In some applications, transmission shift timing relies on signal outputs from the throttle body. If the throttle position sensor is defective, that might adversely affect shift timing and feel.

How do mechanics replace the throttle body?

  • The engine cover is removed, if necessary.
  • The flexible rubber snorkel from the air filter housing to the throttle body is disconnected. Typically, the connection is made with a large stainless steel hose clamp.
  • The electrical connections to the throttle body are removed.
  • If the throttle body is not a drive-by-wire system, the accelerator cable and cruise control cable are disconnected and set aside.
  • The bolts retaining the throttle body to the plenum, the gasket, and the throttle body are removed. If the throttle body is being cleaned and tested for re-use, approved chemicals are used in the cleaning process.
  • The new or serviced throttle body is re-attached to the plenum and the bolts torqued to factory specifications.
  • All cables and electrical connections are restored. The intake air snorkel is reconnected.
  • If applicable, the electronic throttle installation and idle re-learn procedures are performed using an appropriate scan tool.
  • Finally, the engine is started, brought to normal operating temperature, and idle speed is checked. The car is road tested to ensure normal operation and no illumination of warning or service lights.

Is it safe to drive with a throttle body problem?

Yes. But, the vehicle may be limited in power or put into what is referred to as limp mode, in order to get the vehicle to a repair facility. If the check engine light is on, or the electronic throttle control warning light is on, but there is no noticeable difference in engine performance, the car can be safely driven. However, it is best to have it diagnosed and repaired at your earliest convenience to avoid unexpected breakdown or possible damage to the catalytic converter.

When replacing the throttle body keep in mind:

  • Many modern throttle bodies have spring loaded sensors and plastic gears that are not intended to be manipulated directly during any diagnostics or inspections. These components are controlled electronically or generate signals. It is best to let a mechanic use approved tests to diagnose the problem.
  • Wiring faults, bad grounds, or bad terminal connections can make it appear as though an electronically controlled throttle has failed. A mechanic will always rule out all other causes before replacing the throttle body.
  • When cleaning the throttle body, special care should be taken to use only special spray cleaners designed to not damage electrical components or sensors.

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YourMechanic BMW Service

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Rating Summary
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5,025
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Joe

42 years of experience
766 reviews
Joe
42 years of experience
BMW 328i - Throttle Body - Tampa, Florida
Very knowledgeable and finished job quickly.

Donald

39 years of experience
124 reviews
Donald
39 years of experience
BMW 750Li - Throttle Body - Duluth, Georgia
Donald showed up on time and completed the job at hand in the time that I was originally quoted it would take. Should there be another occasion where I need to service my car I'd probably ask for him.

Andrew

10 years of experience
649 reviews
Andrew
10 years of experience
BMW 328xi - Throttle Body - Kansas City, Missouri
Andrew did a great job replacing my starter. He communicated with me throughout the process, arrived on time, and was very professional. The repair went smoothly and my car is running great. I will definitely use Andrew and Your Mechanic for future services.

Nicholas

10 years of experience
303 reviews
Nicholas
10 years of experience
BMW M3 - Pre-purchase Car Inspection - Spring, Texas
Mechanic was punctual, polite and did inspection as expected. Overall satisfied. Still I question his less than "very good" rating of brake fluid condition given that brake service had been completed 3,000 mi / 8 months prior to inspection.

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YourMechanic BMW Service

Average Rating

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Number of Reviews

5,415

Rating Summary
5,025
185
53
38
114
5,025
185
53
38
114
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services done by our mechanics
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