The 2021 Audi TT has 57 electrical parts with verified fitment on this page — 8 part types and 22 brands, covering both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 Audi TT, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. 45 parts of the 57 listed are Battery (28 parts), Starter Motor (9 parts) and Alternator / Generator (8 parts). The other 5 part types cover the remaining 12 parts.
The 2021 Audi TT was sold with both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. 39 parts fit every engine; the other 18 are engine-specific. Each part shows which engine(s) it fits.
22 brands supply electrical parts for the 2021 Audi TT, led by ACDELCO (6 parts), DEKA (4 parts) and FVP (4 parts), plus 19 more brands. Quality grades include AGM, Remanufactured and New.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Audi TT. 12 parts have it, including TYC 221073 (Alternator / Generator) and DEKA 9A47 (Battery). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC Popular Fits: 2.0L L4 Turbocharged | 221073 | 🇺🇸 US 🇨🇦 CA | Convertible150 Amps | View on Amazon |
| TYC Popular Fits: 2.0L L4 Turbocharged | 221081 | 🇺🇸 US 🇨🇦 CA | TT QuattroBosch Brand | View on Amazon |
| VALEO Fits: 2.0L L4 Turbocharged | 443427 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 150 Amps | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Fits: 2.0L L4 Turbocharged | 10417 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| REMY Fits: 2.0L L4 Turbocharged | 11316 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| TERREPOWER Fits: 2.0L L4 Turbocharged | 42345 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC Fits: 2.5L L5 Turbocharged | 221073 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Body code FV150 Amps | View on Amazon |
| VALEO Fits: 2.5L L5 Turbocharged | 443007 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 180 Amps | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
8 Alternator / Generator parts for the 2021 Audi TT come from 5 brands — TYC, VALEO, PURE ENERGY and 2 other brands. The "Popular" part is TYC 221073.
The New section lists 3 options from TYC and VALEO — brand-new units rather than rebuilt ones. TYC 221073 is listed in this group.
The Remanufactured section lists 3 options from PURE ENERGY, REMY and TERREPOWER — factory-rebuilt units with new wear components. PURE ENERGY 10417 is listed in this group.
2 further parts sit outside the graded sections, with the same engine-level match.
Part numbers include TYC 221073, TYC 221081 and VALEO 443427, among others listed above.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular Fits: all 2021 TT engines | 9A47 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| DEKA Popular Fits: all 2021 TT engines | 9A48 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| DEKA Popular Fits: all 2021 TT engines | 9A94R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| FVP Popular Fits: all 2021 TT engines | P94RAGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 94R | View on Amazon |
| LUCAS Popular Fits: 2.0L L4 Turbocharged | LBAGM004A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 48AGM | View on Amazon |
| LUCAS Popular Fits: all 2021 TT engines | LBAGM005A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 94RAGM | View on Amazon |
| ACDELCO Fits: 2.0L L4 Turbocharged | 48AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 48 | View on Amazon |
| ACDELCO Fits: all 2021 TT engines | 94RAGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| ACDELCO Fits: 2.0L L4 Turbocharged | 48AGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| ACDELCO Fits: all 2021 TT engines | 94RAGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 94R | View on Amazon |
| ACDELCO Fits: all 2021 TT engines | 49AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 49 | View on Amazon |
| ACDELCO Fits: all 2021 TT engines | 49AGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| BOSCH Fits: all 2021 TT engines | S6587B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AGMAGM | View on Amazon |
| BOSCH Fits: all 2021 TT engines | S6588B | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | AGMAGM | View on Amazon |
| DEKA Fits: all 2021 TT engines | 9A49 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | IntimidatorAGM | View on Amazon |
| EXIDE Fits: all 2021 TT engines | MXH6L348 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 48 (H6) | View on Amazon |
| EXIDE Fits: all 2021 TT engines | MXH7L494R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 94R (H7) | View on Amazon |
| EXIDE Fits: all 2021 TT engines | MXH8L549 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Marathon MaxBCI Group 49 (H8) | View on Amazon |
| FVP Fits: all 2021 TT engines | P49AGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 49 | View on Amazon |
| FVP Fits: all 2021 TT engines | P48AGM | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Platinum AGMBCI Group: 48 | View on Amazon |
| LUCAS Fits: all 2021 TT engines | LBAGM006A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group: 49AGM | View on Amazon |
| MOTORCRAFT Fits: all 2021 TT engines | BAGM49H8 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Tested Tough AGMBCI Group: 49/H8 or BCI Group 49 | View on Amazon |
| P1MAX Fits: 2.0L L4 Turbocharged | PMAGMH648 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 48 AGM760 CCA | View on Amazon |
| P1MAX Fits: all 2021 TT engines | PMAGMH794R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 94R AGM800 CCA | View on Amazon |
| P1MAX Fits: all 2021 TT engines | PMAGMH849 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 49 AGM850 CCA | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER Fits: 2.0L L4 Turbocharged | FT68048 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 48(Length X Width X Height) 10.94 In x 6.89 In x 7.48 In | View on Amazon |
| FULLRIVER Fits: all 2021 TT engines | FT85094R | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 94R(Length X Width X Height) 12.36 In x 6.85 In x 7.48 In | View on Amazon |
| FULLRIVER Fits: all 2021 TT engines | FT89049 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | BCI Group 49(Length X Width X Height) 13.9 In x 6.89 In x 7.48 In | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
28 Battery parts are listed for the 2021 Audi TT, from ACDELCO, DEKA, FVP and 6 other brands. DEKA 9A47 carries the "Popular" badge. They are grouped as AGM (Extended Life) and Performance AGM (Extended Life + Increased Power), with AGM (Extended Life) the largest group at 25 parts from ACDELCO, DEKA, FVP and 5 other brands.
Battery Current Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.0L L4 Turbocharged | BSC57 | 🇺🇸 US 🇨🇦 CA | Intelligent Battery Sensor | View on Amazon |
This table covers the Battery Current sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
This group shows a single part: STANDARD MOTOR PRODUCTS BSC57.
HID Lighting Ballast
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 2.0L L4 Turbocharged | 601060 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with LED Lights | View on Amazon |
This table covers the HID Lighting ballasts.
This group shows a single part: DORMAN 601060.
Lighting Control Module (LCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: all 2021 TT engines | 4G0907697F | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | LED Headlights | View on Amazon |
This table covers the modules that control the exterior lighting.
This group shows a single part: ÜRO PARTS 4G0907697F.
Parking Aid Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 TT engines | PPS212 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 TT engines | PPS120 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| HELLA Fits: all 2021 TT engines | 358141711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3-Pin ConnectorPlugged | View on Amazon |
| HELLA Fits: all 2021 TT engines | 358270331 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3-Pin ConnectorPlugged | View on Amazon |
| MARELLI Fits: 2.5L L5 Turbocharged | SDP107 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| VARIOUS MFR Fits: 2.0L L4 Turbocharged | AU1075104 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Customer Paints to Match | View on Amazon |
| VARIOUS MFR Fits: 2.0L L4 Turbocharged | AU1075103 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Customer Paints to Match | View on Amazon |
This table covers the ultrasonic park-aid sensors in the bumper. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
7 Parking Aid Sensor parts for the 2021 Audi TT come from 4 brands — STANDARD MOTOR PRODUCTS, HELLA, VARIOUS MFR and 1 other brand. The "Popular" part is STANDARD MOTOR PRODUCTS PPS212. 4 parts fit every engine; the other 3 are engine-specific.
This group includes STANDARD MOTOR PRODUCTS PPS212, STANDARD MOTOR PRODUCTS PPS120 and HELLA 358141711 and the remaining parts above.
Rain Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: all 2021 TT engines | V10721602 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VEMO Fits: all 2021 TT engines | V10721604 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Holder | View on Amazon |
This table covers the Rain sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
2 Rain Sensor parts for the 2021 Audi TT come from VEMO. Every part fits both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged.
This group includes VEMO V10721602 and VEMO V10721604.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Popular Fits: all 2021 TT engines | SR6601N | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WAI GLOBAL Popular Fits: all 2021 TT engines | 30236N | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Bosch Unit | View on Amazon |
| VALEO Fits: all 2021 TT engines | 438339 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Start/Stop Feature2.2 Kilowatt | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: all 2021 TT engines | 12791 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| PURE ENERGY Fits: all 2021 TT engines | 12791 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| REMY Fits: all 2021 TT engines | 16655 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| TERREPOWER Fits: all 2021 TT engines | 52230 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Remanufactured | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: all 2021 TT engines | 011613291 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| HELLA Fits: all 2021 TT engines | 012528581 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
9 Starter Motor parts for the 2021 Audi TT come from 8 brands — HELLA, BOSCH, WAI GLOBAL and 5 other brands. The "Popular" part is BOSCH SR6601N. Every part fits both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged.
The New section: 3 options from BOSCH, WAI GLOBAL and VALEO. BOSCH SR6601N is listed in this group.
The Remanufactured section: 4 options from FVP, PURE ENERGY, REMY and 1 other brand. FVP 12791 is listed in this group.
2 further parts sit outside the graded sections, with the same engine-level match.
Listed part numbers: BOSCH SR6601N, WAI GLOBAL 30236N and VALEO 438339, plus the other parts above.
Buying Electrical Parts for a 2021 Audi TT
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Some electrical parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Battery and Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2021 Audi TT?
Our catalog currently lists 57 electrical parts for the 2021 Audi TT across 8 subcategories and 22 brands, covering both the 2.0L L4 Turbocharged and the 2.5L L5 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2021 Audi TT engines?
Some do. 39 parts fit every engine; the other 18 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 2021 Audi TT?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Audi TT was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Audi TT?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Audi TT
Electrical Parts for Other Audi TT Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.