P1300 on Lexus: Causes, Symptoms and Fix Cost
Quick Answer
Not safe to drive
P1300 on a Lexus is a manufacturer-specific code. Toyota and Lexus define it as igniter circuit No. 1: the engine computer sends an ignition timing signal (IGT) and does not get the confirmation signal (IGF) back from the igniter. Ford lists it as a boost calibration fault, a turbo boost pressure fault that is usually traced to the boost pressure sensor or its wiring, and Honda, Audi and Volkswagen list it as a random misfire. The repair steps below cover the Toyota and Lexus meaning only. It is not the same as P0300, which is a random misfire code on every make.
- Severity
- High · Ignition
- Typical repair cost, all makes
- €60-€1800
Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Lexus and Skanyx tells you what P1300 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P1300 mean on a Lexus?
The Quick Answer above is the generic definition. What follows is the model-specific detail for the Lexus models that log P1300.
Lexus GS 300 3.0
2000
Lexus lists P1300 as igniter circuit No. 1: the engine computer commands ignition on the No. 1 igniter circuit and does not receive the expected IGF confirmation. A 2000 GS 300 owner with the 3.0-litre six had a car that tried to start but would not run, with P1300 returning right after clearing. A used igniter did not cure it, and a workshop found a ground fault at the connection to the cylinder 6 coil and replaced a frayed wire.
Source: tat.net.au, 2carpros.com
Sources
- tat.net.au tat.net.au/scandata/codes/code-view.php?id=5743
- 2carpros.com 2carpros.com/questions/p1300-igniter-circuit-malfunction--1645616
What causes P1300 on a Lexus?
Beyond the generic causes listed on the main P1300 page, these are the patterns noted for Lexus models:
Frayed ground or wire at a coil connector
: Lexus GS 300 3.0
Igniter or coil assembly
: Lexus GS 300 3.0
How to diagnose P1300 on a Lexus with OBD2
- Confirm the car is a Toyota or Lexus. On a Ford the same number is a boost calibration fault, where the boost pressure sensor and its wiring are the first place to look, and parts bought for the wrong definition will not help
- Read all codes. P1300 is the number 1 igniter circuit, so look for codes for other igniter circuits stored with it: several together suggest a shared fault such as power or ground, one alone points at that coil and its wiring
- Inspect the coil and igniter connectors for broken wires, loose pins and corrosion, and look for harness damage near the valve cover or where the intake has been removed
- Check power and ground at the coil and igniter. Poor grounds and power-side problems are among the most common causes
- Check that the crankshaft position sensor is giving a signal, since the igniter gets no trigger without it
- Check the IGT trigger and IGF return signals with a scope or test light. A generic reader cannot show these signals, so this step needs a workshop or a proper tester
- Replace the igniter or coil only after wiring, power and ground are proven good, then clear the code and road test
How much does P1300 cost to fix on a Lexus? (EUR)
Estimated repair costs for P1300 in EUR, compiled across makes. Expect Lexus parts and labour towards the upper end of each range.
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Diagnose the IGT and IGF circuit with a scope or meter | €0–€0 | €60–€130 | €60–€130 | Professional |
| Repair a damaged ground or igniter wiring | €10–€50 | €60–€180 | €70–€230 | Moderate |
| Replace igniter or ignition coil assembly | €30–€250 | €40–€150 | €70–€400 | Moderate |
| Replace crankshaft position sensor | €20–€100 | €50–€200 | €70–€300 | Moderate |
| Replace coil set and spark plugs | €120–€430 | €80–€250 | €200–€680 | Moderate |
| Engine computer repair or replacement (rare) | €400–€1500 | €100–€300 | €500–€1800 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
Codes related to P1300
These codes are often seen alongside P1300 or point to related issues, on any make:
Looking for the full P1300 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P1300 guide