BMW & Mercedes-Benz
Electrical & Ignition
Coils, plugs, batteries, alternators, sensors, and modules.
Compared to current list price at local franchise dealership parts departments. Same-day or next-day delivery based on order time and stock. Delivery radius measured from our Fullerton warehouse.
Common parts
- Ignition coils
- Spark plugs
- Batteries
- Alternators
- Camshaft sensors
- Crankshaft sensors
- Mass air flow sensors
Counter diagnostics
Symptom → likely part
What we hear on the phone, and what it usually turns out to be. Read the data before you buy the part.
| What you’re seeing | Likely part | OEM or aftermarket |
|---|---|---|
| 01Misfire under load, one cylinder | Ignition coil, then plug | OEM coils only |
| 02Rough idle after a cold night | Plugs at interval, or a cracked boot | OEM |
| 03Crank, no start, no tach sweep | Crankshaft position sensor | OEM |
| 04Battery drains in three days | Battery age, IBS sensor, or a module awake | OEM battery |
| 05Charging fault, dimming lights | Alternator or voltage regulator | OEM or reman |
| 06Lean codes on both banks | MAF sensor or an intake leak | OEM MAF |
| 07New battery, same warnings | Battery not registered to the car | Coding, not a part |
Fitment at a glance
BMW chassis
- N20 / N26
- N54 / N55
- B46 / B48
- B58
- S55
- F30 / G20 / G30
Mercedes-Benz chassis & engines
- M274
- M276
- M256
- W205
- W213
- X253
Not a complete list. Send the VIN and we confirm the fitment before you buy.
What drives the price
Genuine, OEM supplier, aftermarket
Ignition and sensors are the category where genuine is usually the cheap answer. A Bosch or Delphi coil built to factory spec keeps the misfire away for 60,000 miles. A bargain coil can come back inside a year, and the second visit is on your labor.
The OEM-supplier line here is nearly all of it: Bosch, Delphi, Hella, Siemens VDO. The same coil, sensor or MAF in the supplier box runs well under dealer list.
Aftermarket is fine on batteries, bulbs, relays and wiring pigtails. It is not fine on MAF sensors, camshaft sensors or coils. Those are the parts that send a car back to you with the same code.
Three prices, one part
Dealer list
100%
The number on the franchise counter’s screen. Your baseline.
Our OEM price
−15%
Priced at least 15% under dealer list on the same genuine or OEM-supplier box, delivered.
Quality aftermarket
Lower
Named brands only, where aftermarket is the right call for this job.
Compared to current list price at local franchise dealership parts departments.
Same-day or next-day delivery based on order time and stock. Delivery radius measured from our Fullerton warehouse.
What usually sends these in
Misfire, rough idle, a battery-registration due, a sensor code you already pulled.
BMW: N20/N55/B58 coil packs.
Mercedes-Benz: M274/M276 coils and sensors.
Serving
Free delivery on orders $200+ within 10 miles of Fullerton.
Questions
Electrical & Ignition, answered
- Both. We quote genuine, OEM-supplier, and quality aftermarket side by side, then you pick the one that fits the job and the budget.