Q: OBD sensor not reading scanner

asked by on

My OBD sensor is not reading the scanner for an emissions test. I can't find the source of the problem.

This sounds like there is no power to the data bus network. This means that the OBD2 plug on your vehicle is not being powered by the battery. I would enlist the help of a qualified technician to find a wiring diagram for your OBD2 plug to trace wires and find where the loss of power is. This is an important repair to have done as the OBD2 system is a vital part of vehicle diagnosis. For example, if any warning lights were to appear on your dash such as Check Engine, Airbag, or ABS, these codes would not be able to be retrieved making it nearly impossible to diagnose. Having a mechanic inspect the electrical issue will allow them to move forward to a repair of your OBD system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. OBD sensor not reading scanner

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Car not going into reverse

Hi. Shifting problems on modern automatic vehicles usually lead to a failing solenoid. If it's a manual, it's more likely a mechanical problem either in the linkage or internal trans parts. I suggest having a mechanic from YourMechanic inspect your...

Q: Old battery tests good. Alternator tested bad but still runs car with a new battery. Shuts off when old battery is put back in.

A brand new battery most likely has a much higher charge than the battery that was in your vehicle or your spare battery. Since these batteries are older and have been drained and recharged multiple times it is possible that...

Q: Emissions test failure - UK?

Hello - not entirely sure how motor vehicle testing is done in the UK (?), but here in the United States, the testing agency provides a printed summary of exactly what does not meet the acceptable standard: excess carbon monoxide,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...