Infiniti check engine light will come on and remain on when the On-Board Diagnostic (OBD) system detects a problem related to the engine or emission system.

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In this guide, you will learn about common problems that trigger Infiniti to come on and how to read the fault codes yourself with an OBD-II scanner. 

What does Check Engine Light or Service Engine Soon mean on an Infiniti? 

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If the check engine light comes on in your Infiniti, it means the onboard diagnostics system (or OBD II) has detected a malfunction in the vehicle"s emissions, ignition, fuel, or exhaust systems. In some cases, the Infiniti check engine light may be triggered by transmission issues as well. 

All 1996 and newer Infiniti vehicles have either a Check engine light or Service Engine Soon light. Including models such as QX80, QX60, QX30, G37, G35, FX35, Q50 JX35. Infiniti check engine light may also be referred to as CEL or MIL.

While your Infiniti check engine light stays on, the vehicle may have increased emissions, decreased fuel economy, and performance issues.

Depending on the problem, your Infiniti may also enter "Home Limp Mode." In this mode, your vehicle speed will be limited to 40 MPH. Engine RPM and power will be limited as well.

Symptoms

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What you may notice when Infiniti service engine soon light comes on is that the engine shakes, but other symptoms include:

Rough runningEngine Misfire or judderingLack of powerPoor throttle responseUnusual soundsSmoke from the exhaust

Any of these symptoms indicate that your engine is not running as it should.

If you don"t notice any symptoms, the problem most likely is related to the emissions system. Still, you shouldn"t ignore this warning lightly. Have your Infiniti diagnosed soon.

How to Reset Infiniti Check Engine Soon Light

Hundreds of fault codes can trigger Infiniti check engine soon light. You, your mechanic, or Infiniti dealer will need to read the Engine Control Unit (ECU).

In this section, you will learn how to read Infiniti fault codes yourself using an OBD2 scanner. Codes should only be reset after the problem(s) have been fixed. 

Locate the diagnostic port under the dashboard.
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Connect your OBD2 scanner to the diagnostic port.
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Turn on the ignition and turn on your scanner. Most OBD2 scanners will power on as soon as you turn on the ignition.
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Select Read Codes from the main menu. Check all Pending, Current, and Permanent codes. 
Write down the code(s) and do further research to understand what each code means.Fix the problems you discover, return to the main menu, select Clear Fault Codes, and press OK. This will reset your Infiniti check engine codes. 

If a loose gas cap triggered your Infiniti check engine light, you could go to Clear Codes, which will erase the check engine light. Otherwise, do not clear the codes without fixing the underlying problem.

What Causes Check Engine Light on an Infiniti?

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The most common problems that cause the check engine light on an Infiniti vehicle are worn spark plugs, bad oxygen sensors, or a loose gas cap. 

Here are Infiniti check engine soon related problems that happen "more-than-usual:

Variable Valve Timing

Almost all Infiniti engines are equipped with Variable Valve Timing. This electro-hydraulic system is operated by the engine oil, meaning that poor oil quality or low oil level can cause the engine to run incorrectly.

This will affect the Intake valve timing control. You may experience hard starting, poor idle and/or stalling, loss of power, and hesitation on accelerations.

Another possible cause is a leaking galley gasket located within the engine, behind the timing chain.

Codes: P0021 or P0011.

Timing control issue

Another possible timing control issue is exhaust side related. Control is done by an electromagnetic solenoid that can fail with time.

Although this can cause driveability issues such as rough running, the only symptom you will see is a check engine light in most cases.

Codes: P0014 or P0024.

Mass Air Flow Sensor

You may have a situation when your engine runs roughly, stalls, does not want to idle and notices a black exhaust smoke.

A dirty MAF sensor can cause this. Only use MAF cleaner fluid for cleaning the sensor.

Code P0101

Oxygen Sensor

Downstream o2 sensors can fail, giving false catalytic converter efficiency readings.

This can be caused by a bad sensor or heat-damaged wiring, as it goes near the exhaust pipes.

Codes: P0138 and P0158

Vacuum Leak

Infinitis are powered with V6 or V8 engines. This means that the intake manifolds are quite complex, with various possible intake vacuum leak points.

As that will cause lean running conditions, you might experience rough idle, lack of power, or hesitation on accelerations.

Codes: P0171 or P0174

Misfire

A random cylinder misfire is something you might experience in your Infiniti.

As this usually happens sporadically, tracing down the cause can be tricky. Besides the obvious bad spark plugs or ignition coil, it can also be caused by dirty fuel injectors or intake air leaks.

Codes: P0300 P0301 P0302 P0303 P0304

EVAP Leak

As with most other cars, Infiniti too can suffer from various EVAP related problems. Usually, you will have a large EVAP leak.

Although this can be caused by a gas cap that doesn"t seal, you may have a leaking Evap Canister vent valve.

Code: P0455

Throttle Body

If your engine idles roughly, the throttle body may be clogged with carbon build-up.

You will need to clean it with a carb cleaner. However, in most cases, this will cause a high idle speed and a check engine light. To remedy this, try the throttle body relearning procedure.

Codes: P0507

Automatic Transmission

Automatic transmission gearboxes have a well-known weak point. A transmission valve body can have an electrical fault, which sends the gearbox into a limp mode and triggers a ˜check engine light.

The root of the problem is usually a broken solenoid electrical connector, and it can be soldered instead of replacing the valve body unit.

Code: P1757 - Front Brake Solenoid Circuit or P0720.

Why is my Infiniti Check Engine Light Flashing On and Off? 

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When your Infiniti check engine light flashes or blinks constantly, it indicates a misfire on one or more cylinders. The problem could be something as simple as a bad spark plug or ignition coil.

It could also indicate a more serious problem, such as a bad head gasket or catalytic converter.

There is no need to panic if your Infiniti check engine light is flashing. You should avoid driving your Infiniti if the check engine light is flashing.

Driving an Infinity with a flashing check engine light would quickly damage a catalytic converter and cause the engine to overheat.

What to do when the Infiniti check engine light comes on?

Check the gas cap. Please remove it. Inspect it for damage. Reinsert the gas cap and tighten it properly. If you get a fault code for a minimal EVAP leak, you may replace the fuel cap.
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Allow the engine to cool down. Once the engine is cool, check engine coolant and oil level.
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If you decide to drive, monitor the engine temperature gauge, and ensure the engine is not overheating.
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Also, if the engine is shaking or your Infiniti check engine light flashes, do not continue driving as this can cause severe damage to the engine and catalytic converter. If there are no performance issues, you may continue driving if the engine is NOT overheating and the oil light is NOT on. Read fault codes from the Engine Control Unit (ECU). 
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Reset Engine Control Unit (ECU)

Accelerator Pedal Release Position Learning

Make sure that the accelerator pedal is fully released.Turn the ignition switch ON and wait at least 2 seconds.Turn the ignition switch OFF wait at least 10 seconds.Turn the ignition switch ON and wait at least 2 seconds.Turn the ignition switch OFF wait at least 10 seconds.

See more: How Many Pints Equal One Gallon ? How Many Pints Are There In One Gallon

Throttle Valve Closed Position Learning

Make sure that the accelerator pedal is fully released.Turn ignition switch to ON.Turn the ignition switch to OFF wait at least 10 seconds.Make sure that the throttle valve moves during the above 10 seconds by confirming the operating sound.

Common Infiniti Check Engine Light Codes

Show Codes

P0100 MAF SensorP0105 Absolute Pressure SensorP0110 IAT SensorP0115 ECT SensorP0120 TP SensorP0125 ECT SensorP0130 Closed Loop, Bank 1 Or Front O2S, Bank 1P0131 Front O2 Sensor, Bank 1 Lean Shift MonitoringP0132 Front O2 Sensor, Bank 1 Rich Shift MonitoringP0133 Front O2 Sensor, Bank 1 Response MonitoringP0134 Front O2 Sensor, Bank 1 High VoltageP0135 Front HO2S Heater, Bank 1P0136 Rear O2S, Bank 1P0137 Rear O2S, Bank 1 Minimum Voltage MonitoringP0138 Rear O2S, Bank 1 Maximum Voltage MonitoringP0139 Rear O2S, Bank 1 Response MonitoringP0140 Rear O2S, Bank 1 High VoltageP0141 Rear H02S Heater, Bank 1P0150 Closed Loop, Bank 2 Or Front O2S, Bank 2P0151 Front O2 Sensor, Bank 2 Lean Shift MonitoringP0152 Front O2 Sensor, Bank 2 Rich Shift MonitoringP0153 Front O2 Sensor, Bank 2 Response MonitoringP0154 Front O2 Sensor, Bank 2 High VoltageP0155 Front HO2S Heater, Bank 2P0156 Rear H02S Sensor, LH BankP0157 P0158 P0159 P0160 Oxygen SensorP0161 Rear H02S Heater, LH Bank Or Bank 2P0171 Fuel System Lean, Bank 1P0172 Fuel System Rich, Bank 1P0174 Fuel System Lean, Bank 2P0175 Fuel System Rich, Bank 2P0180 Tank Fuel Temp SensorP0300 Random MisfireP0301 through P0308 Misfire, Cylinder No. 1 through 8P0325 Knock Sensor, Bank 1P0330 Knock Sensor, Bank 2P0335 CKP Sensor (Pos)P0340 CMPP0400 EGR SystemP0402 EGRC/BPT ValveP0403 EGR Volume Control Valve CircuitP0420 TW Catalyst System, Bank 1P0430 TW Catalyst System, Bank 2P0440 EVAP Small LeakP0443 Purge Control/V & S/VP0446 Vent Control ValveP0450 EVAP Pressure SensorP0500 Vehicle Speed SensorP0505 IACV/AAC ValveP0510 Closed TP SensorP0600 A/T Comm LineP0605 ECM/ECUP0705 PNP Or Inhibitor SwitchP0710 ATF Temp SensorP0720 VSS A/TP0725 Engine Speed SignalP0731 A/T 1ST SignalP0732 A/T 2ND SignalP0733 A/T 3RD SignalP0734 A/T 4TH Signal Or TCCP0740 TCC SV SolenoidP0744 A/T TCC SignalP0745 Line Pressure S/VP0750 Shift Solenoid/V AP0755 Shift Solenoid/V BP1105 MAP/BARO Switch SOL/VP1110 Intake Valve Timing Control, LH BankP1120 TP Sensor 2P1125 Tandem TP SensorP1130 Swirl Control Valve Control Solenoid ValveP1135 Intake Valve Timing Control, RH Bank 2P1140 Intake Valve Timing Control Position Sensor, LH Bank 1P1145 Intake Valve Timing Control Position Sensor, RH Bank 2P1148 Closed Loop, Bank 1P1165 Swirl Control Valve Control Vacuum Check SwitchP1168 Closed Loop, Bank 2P1210 Traction Control Signal CircuitP1220 FPCMP1320 Ignition Signal, PrimaryP1335 CKP Sensor (Ref)P1336 CKP Sensor (POS) CogP1400 EGRC Solenoid/VP1401 EGR Temp SensorP1402 EGR SystemP1440 EVAP Small LeakP1441 VC/V Bypass/VP1443 Canister Control Vacuum Check SwitchP1444 Purge Volume Control/VP1445 Purge Volume Control/VP1446 Vent Control ValveP1447 EVAP Purge FlowP1448 Vent Control ValveP1490 VC/V Bypass/VP1491 VC Cut/V Bypass/VP1492 Purge Control/V S/VP1493 Purge Control/V & S/VP1605 A/T Diag Comm LineP1705 TP Sensor A/TP1706 PNP SwitchP1760 Overrun Clutch S/VP1900 Cooling Fan