On a 2007 Lexus RX350, ignition coil C is the coil for cylinder 3 in the six-coil coil-on-plug ignition system. It sits directly over the spark plug on the engine’s cylinder head as part of Toyota’s COIL A-F labeling for the six ignition coils.
Understanding the ignition coil layout
The RX350 uses a 3.5L V6 engine (2GR-FE) with six individual ignition coils. Each coil sits atop a spark plug. In Toyota service diagrams, coils are labeled A through F to identify which cylinder they service. Coil C corresponds to cylinder 3, and is located on the same bank as cylinders 1–3.
Mapping for quick reference:
- Coil A — Cylinder 1
- Coil B — Cylinder 2
- Coil C — Cylinder 3
- Coil D — Cylinder 4
- Coil E — Cylinder 5
- Coil F — Cylinder 6
Note: If labels A–F aren’t visible, you can identify coil C by locating cylinder 3 on the engine’s bank that houses cylinders 1–3 and tracing the coil directly above that spark plug.
Locating coil C on the physical engine
To physically locate coil C, remove any decorative engine covers, then inspect the top of the engine where the spark plugs sit. You should see six coil-on-plug units with electrical connectors. Coil C will be the one above cylinder 3 on the designated bank. If your coils are labeled, coil C will be clearly marked on the coil housing.
Access considerations: Coil removal requires disconnecting the electrical connector and removing the mounting bolt(s). Work with the battery disconnected and the engine cool.
Step-by-step quick guide to replace coil C (optional)
Before replacing, ensure you have the correct replacement coil for the 2GR‑FE and follow proper torque specs. The steps below are general guidance; consult the factory manual for exact values.
- Disconnect the negative battery terminal and, if applicable, relieve fuel system pressure.
- Disconnect the coil’s electrical connector and remove the mounting bolt(s) securing the coil.
- Gently lift the coil straight up to clear the spark plug.
- Seat the new coil onto the spark plug and reinstall the mounting bolt(s); reconnect the electrical connector.
- Repeat for any other coils if you’re replacing more than one.
- Reconnect the battery and start the engine to verify operation and check for misfires.
When reinstalling, ensure the connector is fully seated and there are no oil leaks around the coil seal. If misfiring persists after replacement, inspect the spark plug, coil boot, and wiring harness for damage.
Summary
Ignition coil C on a 2007 Lexus RX350 is the coil for cylinder 3 in the vehicle’s coil-on-plug ignition system. It’s one of six COP units mounted on the cylinder heads; identify it via the A–F labeling or by cross-referencing cylinder 3. Access involves removing the engine cover and one mounting bolt, then disconnecting the electrical connector. If you’re unsure, consult a professional or the factory service manual for precise diagrams and torque specifications.
How many ignition coils does a Lexus RX 350 have?
There are six coils, one for each cylinder.
How much does it cost to replace ignition coils on a Lexus RX350?
The average cost for a Lexus RX350 Ignition Coil Replacement is between $269 and $305. Labor costs are estimated between $72 and $106 while parts are priced between $197 and $199. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
Which coil is ignition coil C?
This DTC refers to an electrical problem with Ignition Coil “C” (which is the coil located at the #3 cylinder) or its circuit. The P0353 code may trigger from an issue detected from the primary (computer) side or secondary (spark plug) side of the circuit.
What are the common problems with a 2007 Lexus RX 350?
Common Issues to Know by Generation
For example, the 2007 RX 350 is known for issues like engine oil leaks, cracks forming on the dashboard, and leaks in the power steering system.