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Check Engine Light

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P0804 OBD-II Trouble Code: Upshift (Skip Shift) Lamp Control Circuit Malfunction
What What the P0804 code means Your vehicle’s powertrain control module (PCM) has detected a malfunction in the one through four skip shift solenoid lamp control circuit. The one through four skip shift solenoid control circuit is also known as...
P0304 OBD-II Trouble Code: Cylinder 4 Misfire Detected
P0304 code definition P0304 is a diagnostic trouble code seen when a misfire is detected in cylinder 4. This code may...
Top 7 Reasons Your Check Engine Light is On
While While it’s often assumed that the check engine light (CEL) is an indication of a major mechanical issue, this isn’t always the case. In fact, according to many professional mechanics, a warning light can be caused by a minor...
Symptoms of a Bad or Failing Crankshaft Position Sensor
Common signs of a faulty crankshaft position sensor include issues starting the vehicle, intermittent stalling, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Fuel Filter
If your car is hard to start, experiencing engine performance issues, or has the Check Engine Light on, you may need to replace the fuel filter.
Common Signs of a Dirty Air Filter
A car air filter cleans the air entering the engine. Signs of a dirty air filter include a misfiring engine, unusual noises, and reduced fuel economy.
Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.
P0420 OBD-II Trouble Code: Catalyst System Efficiency Below Threshold (Bank 1)
P0420 code means that either the upstream or downstream oxygen sensor in the catalytic converter is not working. Replacing these parts can fix P0420.
What Does the Check Engine Warning Light Mean?
The check engine warning light means there is a problem with the vehicle's engine. This could be due to faulty spark plugs or defective sensors.
How to Read and Understand Check Engine Light (OBD-II) Codes
The Check Engine Light indicates a trouble code stored in the car’s computer and can indicate a number of issues.
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve
Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Catalytic Converter
Common signs include reduced engine performance, rattling sounds, and the Check Engine Light turning on.
Symptoms of a Bad or Failing Brake Master Cylinder
Common signs of a faulty brake master cylinder include abnormal brake pedal behavior, contaminated brake fluid, and the Check Engine Light turning on.
P0171 OBD-II Trouble Code: System Too Lean (Bank 1)
P0171 code definition System Too Lean (Bank 1) What the P0171 code means The P0171 OBD-II code means that, on the first...
Symptoms of a Bad or Failing Engine Control Module (ECM)
Common signs of a failing PCM/ECM/ECU include the Check Engine Light coming on, engine performance issues, and the car not starting.
Is It Safe to Drive with the Check Engine Light On?
The check engine light is tied into your car’s onboard diagnostics system, and it’s designed to light up (usually in yellow) whenever...
P2165 OBD-II Throttle/Pedal Pos Sensor C Maximum Stop Perf
P2165 P2165 code definition The code P2165 means that there is a malfunction with the “C” pedal position sensor circuit. What the P2165 code means The vehicle’s PCM (powertrain control module) monitors the throttle pedal position sensors. If it stores...
P0999 Shift Solenoid F Control Circuit High
P0999 P0999 code definition The P0999 code identifies a problem in an automatic transmission in the shift solenoid F circuitry and sets the code. What the P0999 code means A P0999 code the OBD-II generic code for a problem between...
P2214 NOx Sensor Circ Range/Perf Bank2
P2214 P2214 code definition The P2214 code occurs when the powertrain control module has detected that the nitric oxide and nitrogen dioxide gases (NOx) sensor circuit voltage reading is not in the anticipated levels for the engine bank (in this...
P2046 OBD-II Trouble Code: Reductant Temp Sensor Circ Interm
P2046 P2046 code definition The P2046 code indicates that there has been a malfunction in the reductant injector air temperature sensor circuit. What the P2046 code means The reductant injector is part of the system that reduces the gas...

Related questions

Question
I changed spark plugs and wires & cleaned throttle body, car idles rough and gas mileage is changed does not backfire or anything
A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...
Question
Crankshaft and camshaft position sensor circuit malfunction
The 335 and 340 codes are for crankshaft and camshaft circuits. This could be bad sensors, or it could be an issue in the wiring to the sensors. The 421 is for a catalyst performance. It can come up because...
Question
I have an 2002 Infiniti i35 which had a code reading “P0301” for bad coil
You will need to have the number one cylinder injector tested to see if it is getting signal from computer and cylinder compression to see if it has an internal engine problem. Then if these are okay then will need...
Question
How to fix code p2096/fuel trim system too lean bank 1 in a 2012 Kia soul?
P2096 will set if the air fuel ratio in the engine is off. In your circumstance, the short and long term fuel trim values should be read and evaluated using a real time scan tool as that will help narrow...
Question
Why is the check engine light always on?
You are correct that when the Check Engine light is illuminated with no drive symptoms you will not have any indicator if any more problems are happening. That is, unless another light comes on or you get symptoms you did...
Question
Why is my car having problems starting?
Hey there. This may be related to to a variety of things. When your Check Engine Light comes on, generally there are fault codes that are registered in the car's computer which will indicate more specifically some of the possible...
Question
Why does the check engine light keep coming back on?
The check engine light comes on and stays on if the onboard computer sees a problem that could cause an increase in emissions or a problem with its systems. After looking at most of the possible codes or issues that...
Question
White smoke coming from tailpipe
The white smoke is a sign that coolant or water is leaking into the cylinders. The radiator and overflow container are examined and checked for the right amount of fluids. The engine oil is checked next to make sure it...
Question
Where is temperature sensor
The engine coolant temperature sensor should be located on the radiator hose fitting on the front of the engine. The connector is locked in place by a clip lock on the connector housing that needs to be depressed at the...
Question
What is wrong with my car?
A flashing check engine light means that there is a problem that may damage the car if you continue to drive. Most often it comes on when there is a misfire, and the potential damage is damage to the catalytic...
Question
What is a throttle body filter
Code P0068 can have to do with the Throttle Position Sensor. It can also be due to a Mass Air Flow sensor fault. Usually this code can be set due to a vacuum leak, either somewhere in the air intake...
Question
What else should I do?
The fuel injectors on this engine can intermittent stick causing a misfire. The fix is to replace the injector for the cylinder having the problem. This is from a carbon build up in the injector pintle. I would recommend having...
Question
What does the Service Engine Soon Light mean?
The meaning of the "Service Engine Soon" Light is dependent on the make and model of your car and the manufacturer’s specifications. There are numerous dashboard indicator lights, and the particular indicator lights that are included on a dashboard are...
Question
We changed our fuel pump
You need to have the fuel pressure regulator and injectors checked for leaking. The fuel pressure regulator is most likely leaking into the intake and causing the excessive fuel to get into the cylinders. I'd suggest getting the vehicle...
Question
Warning light on
Hi, the Check Engine Light turns on when the car's computer detects a fault somewhere. While you are driving the car, the computer is constantly checking all of the signals coming from the sensors throughout the vehicle. The computer knows...
Question
Vehicle whining after belt replacement
Hi there. I would suspect another pulley that the serpentine belt drives has a dry/loose bearing. Have a certified mechanic, like ones from YourMechanic, inspect the noise and check each pulley for play.
Question
Vacuum leak
Hi. This is a very common failure on vehicles like yours. So common, in fact, that there is a technical service bulletin (TSB) on it. The TSB is XT303-13 and it addressed the hissing sound from under the hood, as...
Question
Truck running rough
Hello. If this only occurs when the engine is cold then you may have a sensor reading incorrectly or you may have a vacuum leak. Most of the time if the Check Engine Light is on I start by scanning...
Question
Transmission?
Hello. Thanks for your question about your Check Engine Light (CEL) illuminating for what appears to be a transmission issue. There are both electronic and hydraulic controls in your transmission that control shifting. The electronic controls use sensor inputs and...
Question
Transmission won't shift out of second gear
All three problems may be related. You will have to get the computer scanned to see if you have a bad speed sensor. The speed sensor will sense the speed in which you are going; the computer will use this...

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