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OBD-II

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Should I Buy a Bidirectional Scanner?

Automotive technician jobs require mechanics to use bidirectional scanner to take as well as input information when diagnosing car problems.

P1101 OBD-II Trouble Code: Mass Airflow Sensor Out of Self Test Range

P1101 means there is an issue with the mass airflow sensor system. It is likely due to a faulty sensor, bad connectors, or an air leak.

P2A00 OBD-II Trouble Code: O2 Sensor Circuit Range/Performance Bank 1 Sensor 1

P2A00 means there is an abnormal voltage reading from the O2 sensor, possibly due to a defective sensor, malfunctioning circuit, or leak.

P0847 OBD-II Trouble Code: Transmission Fluid Pressure Sensor/Switch “B” Circuit Low

P0847 means the sensor "B" circuit in the transmission fluid pressure sensor is not working properly, possibly due to component or fluid issues.

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

OBD-II Trouble Code P0688: ECM/PCM Power Relay Sense Circuit/Open

P0688 means there is an output circuit issue in the power relay sense circuit, likely due to a damaged or defective ECM relay or faulty wiring.

OBD-II Trouble Code P0650: Malfunction Indicator Lamp (MIL) Control Circuit Malfunction

P0650 means there is a computer output circuit issue, likely due to a defective electrical circuit or bulb.

P1116 OBD-II Trouble Code: Engine Coolant Sensor Out Of Range/ECT Sensor Out Of Self Test Range

P1116 P1116 definition A P1116 trouble code is related to a vehicle’s engine coolant sensor (https://www.yourmechanic.com/article/how-to-replace-a-coolant-temperature-switch-sensor-by-timothy-charlet) that sends a temperature signal to the engine computer so it can relay a signal to the temperature gauge (https://www.yourmechanic.com/article/3-essential-things-to-know-about-your-car-s-temperature-gauge) in your dash. What...

P0770 OBD-II Trouble Code: Shift Solenoid E Malfunction

P0770 means there is a malfunction of shift solenoid E on the transmission valve body, likely due to a faulty shift solenoid or issue with the fluid.

P0868 OBD-II Trouble Code: Transmission Fluid Pressure Low

P0868 means there the transmission fluid pressure is too low. This is likely due to a leak, malfunctioning sensor, or overheating.

P2002 OBD-II Trouble Code: Diesel Particulate Filter Efficiency Below Threshold Bank 1

P2002 means there is an efficiency issue with the particulate filter in the exhaust, likely due to a faulty filter or sensor, or exhaust leak.

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

Are Lights the Only Thing the OBD Uses to Warn the Driver of Issues?

If If your car was manufactured after 1996, it has an OBD II system that monitors emissions and other systems on board. While it’s primarily focused on emissions, it can also report other problems that are only peripherally related to...

B1977 OBD-II Trouble Code: Passenger’s Front Seat Up Switch Circuit Short to Battery

B1977 means there is a passenger front seat up switch circuit malfunction, likely due to damaged electrical components or a faulty switch.

OBD-II Trouble Code P0517: Battery Temperature Sensor Circuit High

P0517 means there is an issue with the speed controls and idle control system, likely due to a defective battery or faulty electrical wiring.

Related questions

Noise coming from the engine

The noise would need to be heard by a mechanic to determine if it is an engine noise, or ignition problem. The code P0455 is a generic code for a major emission vapor leak, and is most common to be...

car cranks but doesn't start

When this situation occurs, the first thing I look for is checking the fuses or electrical relays to the ECU. In general, the most common cause of being unable to connect to the scanner or to the ECU is caused...

Looking for info about most common OBD2 Codes

There are two (at least) quite distinct issues in regard to your general request: The first is, once a check engine light illuminates, what are the most "frequent" codes that are stored and thence downloaded, that is what does THAT...

Where is the plug in for the code reader? 2013 Honda Civic

I am working on this

The Check Engine Light comes back on after I reset it

When the Check Engine Light comes on without any specific warning, this can indicate a variety of possible issues. Unfortunately, without more specific symptoms, this can be tough to diagnose without the use of a scanning tool and the skill...

Hello there. The knock sensor code (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-faulty-knock-sensor) can have various causes on your 2004 Chevrolet Silverado. The knock sensor circuit low, bank 1 code is telling us that the knock sensor in bank 1 that it has low circuit voltage....

How do you get Check Engine Light reading with no OBD-II plug?

All vehicles that are newer than 1996 and sold in the United States are required to have an OBD-2 system. The scanner (https://www.yourmechanic.com/article/can-i-fix-my-car-with-a-home-code-reader-scanner) plug may have been removed for some reason by the previous owner or mechanic. If this is...

ABS light on dash board

Hello. Since this could be a variety of potential issues, I would recommend hooking the car up to an OBD scanner to download any trouble codes that may have registered as a result of the light coming on. I would...

Does the OBD System Measure Gases in the Car's Exhaust?

The onboard diagnostic (OBD) system utilizes sensors mounted in the engine exhaust stream to measure the amount of oxygen that comes out of the engine after the combustion process. When an engine intakes a certain amount of air into the...

What would cause brand new O2 sensors to give codes 172, 173, 176, and 177, rich and lean conditions, both sides at the same time?

When it comes to across-the-board codes being set such as this, it is usually a result of something "upstream" creating the condition to set all these codes. For instance, it is rare for both O2 sensors to fail at exactly...

Car cranks but won't turn over

Hello. This problem could be caused by several different things. You could be out of gas, the fuel pump might be working properly, the timing belt could be broken, there could be an issue with electricity getting to your spark...

Smog check failed due to Oxygen sensor

Hello, thank you for writing in. The first person to tell you this was correct to a certain extent. If the system is not warmed up, the readings cannot be taken accurately. However, if the engine is warmed up and...

Where is the plug in for the code reader?

Your vehicle's OBD connector is located on the driver's side of the vehicle underneath the dash to the right of the steering column just above the gas pedal.

Failed smog test. OBD-II monitors not ready. Needs to be reset

Hello. If your monitors are showing not ready, then that is because the computer was recently reset or the battery may have been replaced. If either of these occurred, then there is a specific amount of driving that needs to...

Can't read OBD code with my scanner.

These aftermarket type scanners may not access every vehicle out there. When you get a cannot communicate issue this is most likely the OBD adapter and the vehicle may be incompatible or the vehicle has problems. You would need to...

I would like to collect brake pedal position information from my OBD2 port. Can this be done?

The brake pedal position does not have a specific wire to the OBD2 connector that can be monitored. You could however monitor the data stream and get the brake on or off PID in the data monitoring. The PID will...

Hey there. If you have the OBD-2 connector under the dash directly under the steering column, then the ELM327 will work to scan the vehicle after you download the app. I can tell you that this adapter is very cheaply...

OBD-II scanner read code P0108

Hello. The MAP sensor reading on a scanner should read about 1.0 to 1.5 volts at idle and 4.5 to 4.8 volts at wide open throttle. The MAP should read 4.8 volts or more when you have the key on...

Does the OBD System Measure Gases in the Car's Exhaust?

The onboard diagnostic (OBD) system utilizes sensors mounted in the engine exhaust stream to measure the amount of oxygen that comes out of the engine after the combustion process. When an engine intakes a certain amount of air into the...

the car has suffocation feeling when accelerator is pressed and does not speed constantly

This sounds like a low fuel pressure problem, or an air filter and mass airflow (MAF) sensor problem. Check the fuel pressure and replace the fuel filter first to see if it helps. Next, have the system computer scanned (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection)...

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