P0293
Fix within a few daysCylinder 12 Fuel Injector Circuit Low
Code P0293 means Cylinder 12 Fuel Injector Circuit Low. Common causes: Faulty injector (70%), wiring issues (25%). Drivability: Limit driving, fix within a few days. Repair cost: $150-$400 DIY, $400-$1200 professional.
Can I Drive With P0293?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Get it fixed promptly.
Stop driving immediately if: Flashing Check Engine Light, significant power loss, loud knocking noises, burning smell, or rotten egg smell from the exhaust.
Symptoms of P0293
- 1Engine misfire or rough idle
- 2Reduced engine power
- 3Poor fuel economy
- 4Engine hesitation or stumbling
- 5Check Engine Light is on or flashing
Common Causes of P0293
Parts most likely causing this code, ranked by probability
The fuel injector for cylinder 12 has an internal electrical fault, causing a low voltage signal or high resistance in its circuit.
70% of P0293 cases are fixed by replacing this part
Damaged, corroded, or loose wiring or connector pins for the cylinder 12 fuel injector prevent proper electrical flow.
25% of P0293 cases are fixed by repairing or replacing wiring
A faulty driver circuit within the ECM for cylinder 12's fuel injector can cause a low circuit signal.
5% of P0293 cases are fixed by replacing this part
Check These First (Before Buying Parts)
- Visually inspect the electrical connector on the cylinder 12 fuel injector for any looseness, corrosion, or damage.
- Check the wiring leading to the cylinder 12 injector for any signs of fraying, cuts, or heat damage.
How to Diagnose P0293
- 1Visually inspect the wiring harness and connector for cylinder 12's fuel injector for any damage, corrosion, or loose connections.
- 2Using a multimeter, check the resistance of the cylinder 12 fuel injector. Compare it to specifications and other injectors.
- 3Use a noid light to check for a pulse signal at the cylinder 12 fuel injector connector while the engine is cranking.
- 4If accessible, swap the cylinder 12 fuel injector with an injector from another cylinder and see if the P0293 code moves to the new cylinder number. If it moves, the injector is faulty.
- 5If the injector tests good and the wiring is intact, test the continuity of the injector circuit back to the ECM.
P0293 on Popular Vehicles
Mercedes-Benz S-Class (V12)
2000-2017Access to cylinder 12 injector on V12 Mercedes engines can be difficult due to intake manifold design. Often requires careful removal of other components. Wiring harness issues are also common due to engine heat.
75% fixed by replacing injector or repairing wiring
BMW 7-Series (V12)
2001-2015BMW V12 engines are known for precise fuel delivery. P0293 typically indicates a failed injector. Ensure proper coding/adaptation if replacing the injector on some models. Check for oil leaks around the valve cover that could contaminate wiring.
70% fixed by replacing injector or repairing wiring
Rolls-Royce Ghost/Wraith (V12)
2009-2024These vehicles use BMW-derived V12 engines. P0293 is a direct indicator of an electrical fault with the cylinder 12 injector. Due to the vehicle's complexity, professional diagnosis is often recommended, but the underlying cause is usually the injector itself or its wiring.
75% fixed by replacing injector or repairing wiring
Frequently Asked Questions
What does P0293 mean?
P0293 indicates an electrical problem with the fuel injector for cylinder 12. The engine computer detects that the electrical circuit for this injector has a lower than expected voltage or higher resistance.
Can I drive with P0293?
Limit driving, fix within a few days. A misfiring cylinder sends unburned fuel into your exhaust, which can quickly damage your catalytic converter. Drive only for essential, short trips.
Will P0293 clear itself?
No, P0293 will not clear itself. This code indicates a hard electrical fault with the injector or its circuit. The issue must be physically repaired, and then the code can be cleared with a scan tool.
How do I fix P0293 myself?
Start by inspecting the wiring and connector for cylinder 12's fuel injector. If they look good, test the injector's resistance with a multimeter. If the resistance is out of spec, replace the cylinder 12 fuel injector. If the wiring or injector tests good, further electrical diagnosis of the circuit is needed.
How much does it cost to fix P0293?
DIY repair costs for P0293 are typically $150-$400, primarily for a new fuel injector. Professional repair costs range from $400-$1200, including parts and labor, as V12 engine access can be complex.
P0293 keeps coming back - why?
If P0293 keeps returning, the initial diagnosis was incomplete. Common reasons include: a faulty wiring repair, a new injector that is also faulty, an intermittent connection, or a rare ECM driver issue that was overlooked.
Will P0293 fail emissions/smog test?
Yes, P0293 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and a misfire directly impacts exhaust emissions.
What's the difference between P0293 and P030C?
P0293 specifically indicates an electrical circuit problem with the cylinder 12 fuel injector. P030C indicates a general misfire detected on cylinder 12. P0293 is a more specific code pointing directly to the injector's electrical function, while P030C just tells you cylinder 12 is misfiring, which could be due to fuel, spark, or compression.
P0293 on Mercedes-Benz S600?
On Mercedes-Benz V12 engines like the S600, P0293 often points to a failing fuel injector. Accessing cylinder 12 can be challenging due to the tight engine bay and complex intake manifold, increasing labor time. Always check the wiring first, as heat can degrade insulation over time.
Questions to Ask Your Mechanic
Did you test the resistance of the cylinder 12 fuel injector?
Good answer: Yes, I measured the resistance and compared it to factory specifications. It was out of range, indicating an internal fault.
What did you find when inspecting the wiring and connector for cylinder 12's injector?
Good answer: I found some corrosion on the connector pins, which I cleaned, but the code persisted. I then tested the injector itself.
Did you check for an injector pulse signal at the connector?
Good answer: Yes, I used a noid light and confirmed there was a pulse, meaning the ECM is trying to fire the injector, but the injector itself has an internal electrical issue.
Repair Cost Estimate
DIY Repair
Parts only
$150-$400
Shop Repair
Parts + labor
$400-$1200
Save $250-$800 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate. Requires a multimeter and potentially a noid light for accurate diagnosis. Accessing the injector on a V12 engine can be complex and time-consuming, requiring careful removal of other engine components.
Cost of Waiting
Ignoring P0293 and the resulting misfire will send unburned fuel into your exhaust system. This rapidly overheats and destroys your catalytic converter, turning a $150-$400 injector job into a $1,500-$4,000 catalytic converter replacement.
While You're In There...
These seals wear out over time and are critical for preventing fuel leaks and ensuring proper injector seating. Replacing them prevents future fuel system issues and is minimal extra labor.
If the fuel rail needs to be removed for injector access, replacing its gaskets or seals is a smart preventative measure to avoid vacuum or fuel leaks later.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Noid Light Set
- Basic Hand Tools (sockets, wrenches)
- Fuel Injector Puller (possibly, depending on vehicle)
- Dielectric Grease
P0293 is a specific electrical fault for one fuel injector. While V12 access can be tricky, the repair is straightforward once the faulty component is identified, and your engine will run smoothly again.
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Your Next Steps
Step 1: Inspect the wiring and connector for cylinder 12's fuel injector. Look for any obvious damage, corrosion, or loose connections. Clean any corrosion and ensure a tight fit.
Step 2: If the wiring looks good, use a multimeter to test the electrical resistance of the cylinder 12 fuel injector. Compare the reading to your vehicle's specifications or to a known good injector on another cylinder. If it's out of spec, the injector is faulty.
Step 3: If the injector resistance is good, use a noid light to confirm the ECM is sending a pulse to the injector. If there's no pulse, the issue is likely in the wiring back to the ECM or the ECM itself. If there is a pulse, but the injector resistance is good, consider swapping the injector with another cylinder to confirm the fault moves.