Skip the auto shop - Our mechanics make house calls

Q: Can't get an emissions test due to faulty plug

asked by on

I have no power to the PCM or DLC to get an emissions test; the plug has no power. I checked the fuse and it is blown, but I can't get close with another fuse before it sparks. The cigarette lighter and DLC are on the same fuse, but I can't get the cigarette lighter out to replace it.

Hi! Since the power fuse was blown and your attempts to install a new fuse causes sparks, it would seem that there is a large draw or short on that power system. First, disconnect the ground cable to the battery and install the new fuse, then reinstall the ground cable to recheck the circuit. If the fuse blows again, then there is a significant short in that circuit and will require a skilled technician to diagnose and repair your blown fuse.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

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: Car seats won't move; is it due to fuses or relay?

Hello. If the seat functions stopped all of a sudden then you either have a blown fuse or a bad circuit breaker. Both are common issues, especially if something is failing in the seat. I would usually check the fuses...

Q: Hello Patrick. I have 2 stud's that have already broke in my rim/tire, it happened one time before and I had to get it burned out

Hi there. Mercedes-Benz lug studs are incredibly brittle and tend to snap under two different situations. First, the stud will be torqued down too tightly, which fuses the stud inside the hub and snaps when it's taken off with an...

Q: Loud sounds coming from the back of the car and can be heard only on the inside

Since I am not able to hear the noise, I am taking a stab at this, but one common item that can make a noise would be a driveshaft center bearing. If the center bearing is going out it will...

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.