BMW 135i Serpentine/Drive Belt Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(32)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(32)

Serpentine/Drive Belt Replacement Service

How much does a Serpentine/Drive Belt Replacement cost?

On average, the cost for a BMW 135i Serpentine/Drive Belt Replacement is $226 with $58 for parts and $168 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2009 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$361.70Shop/Dealer Price$413.19 - $550.63
2012 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$291.63Shop/Dealer Price$324.59 - $414.81
2011 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$291.63Shop/Dealer Price$324.64 - $414.90
2010 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$350.89Shop/Dealer Price$398.71 - $533.41
2013 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$291.63Shop/Dealer Price$327.73 - $420.31
2008 BMW 135iL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$350.89Shop/Dealer Price$399.01 - $533.93
Show example BMW 135i Serpentine/Drive Belt Replacement prices

What is a serpentine belt and how does it work?

A serpentine belt is a relatively long, flat, multi-ribbed belt that is driven by the engine’s crankshaft pulley. The belt drives many, and often all, of the engine accessories such as the alternator, air conditioning compressor, power steering pump, water pump, and air pump. The serpentine belt is tensioned by a hydraulic or spring-loaded automatic tensioner. Some older cars use a serpentine belt to drive most accessories but will also have a shorter v-style belt to drive, for example, the power steering pump.

Belts

When to consider replacing the serpentine belt:

  • Regularly scheduled maintenance. Typically, belt manufacturers recommend belt replacement at 90,000 miles. However, the belt must be inspected for wear or damage at regular intervals prior to this high mileage.
  • Squealing noise, belt slippage, visible belt damage. Should the belt fail or wear out prematurely, you may hear noise or you may see visible signs of deterioration such as missing chunks of rubber, excessive cracking, or a shredded appearance on the edge of the belt.
  • Battery Light. A loose belt, perhaps caused by a defective tensioner, may not drive the alternator at adequate speed and thus the battery may discharge, causing the warning light to illuminate.
  • Engine overheating. Often, the serpentine belt drives the water pump. In those applications, if the belt breaks the engine will overheat in seconds to minutes. If the belt is inadequately tensioned, you may notice higher-than-normal engine operating temperature.

How do mechanics replace the serpentine belt?

  • Prior to removing the belt, the mechanic must run the engine to determine if the idler pulley and the belt tensioner are noise-free. Those rotating components have grease filled bearings and are subject to wear. In addition, the mechanic will ensure that all pulleys and accessories are turning in the same plane. These steps help make sure your new belt will operate trouble-free for its full-service life.
  • The belt’s routing path through the various components is noted. The belt tensioner is released, usually with a wrench or lever, to release the tension from the belt. With the tension off, the belt slides off the pulleys.
  • All rotating components — that is the alternator, air conditioner compressor, etc. — are checked for smooth operation and no noise.
  • If everything checks out, the new belt is slipped over all of the pulleys while holding the tensioner away from the belt. Once the belt is centered on all pulleys, the tensioner is released and the installation is complete. The engine is run to ensure normal operation.

Is it safe to drive with a serpentine belt problem?

No. Should the belt have visible damage, you risk unexpected and sudden breakage that could potentially leave you stranded. Serpentine belt problems that result in the alternator not charging may cause the battery to discharge, which will result in loss of electrical power to the vehicle. Additionally, if a deteriorated belt breaks and that belt drives the water pump, the engine will overheat in a matter of seconds.

When replacing the serpentine belt keep in mind:

  • On many cars, the expected service life of a serpentine belt is around 90,000 miles. Should the belt fail well prior to that, a very careful inspection should be performed to check for out-of-alignment pulleys, a possibly out-of-position crankshaft harmonic balancer on which the drive pulley is mounted, binding pulleys, or a defective belt tensioner.
  • Attention should always be given to serpentine belt routing, since proper routing is critical to proper belt tension, and function of the driven components.
  • Sometimes it is difficult to distinguish serpentine belt related noise from other engine noises. In these cases, a mechanic will determine the origin of the noise by momentarily running the engine without the serpentine belt attached.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(32)

Rating Summary
29
2
0
1
0
29
2
0
1
0

Hernandes

5 years of experience
19 reviews
Hernandes
5 years of experience
135i 2012 - Oil Change - Cupertino, CA
Nice guy

Breck

15 years of experience
760 reviews
Breck
15 years of experience
135i 2008 - Serpentine/Drive Belt - Houston, TX
Great mechanic, very professional and polite. Arrived early and did an excellent job. Highly recommend. Will request for any future mechanical needs.

Carlos

23 years of experience
467 reviews
Carlos
23 years of experience
135i 2008 - Brake Rotor/Disc - Highland, CA
Very good

AL

8 years of experience
232 reviews
AL
8 years of experience
135i 2013 - Valve cover gasket is leaking - Satellite Beach, FL
He was very flexible.

Excellent Rating

(32)

Rating Summary
29
2
0
1
0
29
2
0
1
0
Number of BMW 135i services completed
352+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform

Recent articles & questions

Test a Car Battery: Step-by-Step Guide
Keep your vehicle running smooth with this guide on how to check a car battery. Find out how to test a car battery life with YourMechanic.
P0903 OBD-II Trouble Code: Clutch Actuator Circuit Malfunction
P0903 P0903 OBD-II Trouble Code: Clutch Actuator Circuit Malfunction Diagnostic Trouble Code (DTC): P0903 P0903 code definition P0903 is the OBD-II code for Clutch Actuator Circuit Malfunction. Other codes in the P0900 series may accompany this fault. What the P0903...
How to Prepare for the Mississippi Driver’s Written Test
There’s There’s nothing like the feeling of being out on the road and behind the wheel. Of course, if you hope to get your driver’s license, the first thing you need to do is to pass the written exam. The...

Maintenance for spark plugs and belt. 2011 Honda Crosstour

Hello. The manufacturer’s manual is correct and it is best to follow their maintenance repair schedule. The dealership is probably telling you something different because they have seen spark plugs and timing belts last up to 110,000 to 120,000 miles...

I hear a whooshing sound when I turn the steering wheel. If I make a sharp turn, I hear a grinding sound coming from the back. ???

Hi there. In most cases, the rear knocking sound is caused by the driveshaft, drive axles, differential gears, transmission mount, or the rear struts. The sound you're experiencing is very difficult to diagnose, but could be caused by the power...

Can i put something down gas tank to see how much gas I have?

The filler neck on most vehicles will have a rollover valve that is connected to the end of the filler tube, on the inside of the tank. So, unless someone has removed the rollover valve, you will probably be unable...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com