Question about 2003 Nissan Sentra

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My check engine light bulb does'nt come on

Check engine light bulb does'nt come on when key is turned on but scan tool shows that light is on and there is a dtc.

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Maybe previous owner removed the bulb...

Posted on Sep 29, 2012

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Posted on Jan 02, 2017

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Fred Yearian

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SOURCE: my 1993 nissan sentra 1.6 wont run and check engine light wont turn on,bulb is ok

Could be any of several things. If the crank sensor is marginal and not sending pulses, the fuel pump is shut off. This is for safety. The pump is energized for a few seconds as key is turned in preparation for starting then engine must rotate normally to keep the pump on. If it stops, in a few seconds the fuel is cut off.

Posted on Aug 18, 2012

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Brake Lights all of a sudden not working on my 1995 Tahoe. Checked fuses and lights. Neither burnt out.


The turn signal switch and the hazard switch are likly places to look. To checjk the fuses is'nt to take them out and look at them but to test to see if power will go though them, I use a test light ( a tool that looks like an ice pick with a wire coming out of the handle and the handle is clear with a light bulb inside). with the clip connected to a good ground as you touch the back sides of the fuses the light will light if it only lights on one side, the fuse is blown ( does'nt matter what it looks like ) a bad fuse can look good. the turn signal switch is involved as is the Hazard switch. If you pusth the hazard switch and the lights light good then you know that the lights and the sockets are good. You also know that the wires are good . With the key on the turn signals should work front and back ( thier different cicruits) If only working in the front the turn signal switch is bad provided the hazards worked all the way around. Does the high mount stop light work? It works off of it's own circuit on the brake light switch and if no lights work your back to the fuses only after you checked to see if the high mount bulbs are good. Your car is plenty old enough to have them be burnt out. If the high mount doesn't work with the bulbs known to be good and then you check with the test light to see if the power isd getting to the brake light switch. One wire is hot with the key off and another comes hot with the key on ( the cruze control switch in the brake light).

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1 Answer

When I push the gas on my car it won't go past


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WHY DOES THE ENGINE CHECK LIGHT GOES ON AND OFF STAY ON OFF IN A CHRYSLER TOURING 2007


Hi there,

Your vehicle's OBD computer monitors all your vehicle's electrical emission circuits.

Each time you turn your key, the computer considers this 1 x drive cycle.

When a fault (or out of spec) condition occurs, this will register a fault code in the computer's memory. Some circuits will only trigger the Check Engine Light (CEL) after the same fault occurs a few times. Other circuits will trigger the CEL with just one fault detection.

In the same manner, if the fault condition is only intermittent, the computer may consider the condition recitified, if that fault does not occur after several drive cycles (i.e. the CEL will no longer light up).

The only way to have this resolved is to arrange for your local Mercedes dealership (or authorised service agent) to connect their factory SCAN TOOL.....and read your computer's stored fault codes.

These fault codes will quickly identify the suspected circuits (eliminating unnecessary garage labor costs), allowing quick diagnosis & repair.

Note: Mercedes Scan Tools operate on a different communication protocol. Typical scan tools designed for American & Japanese vehicles use a different protocol, therefore, I recommend this be done only by a Mercedes agent (or European service specialist).

The process of scanning for fault codes only takes 15-25mins (depending on the technician's experience), hence should not cost you much to have this procedure performed.





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First did you reset the computer after replacing the EGR valve if you don't the computer doe'nt reconize the new sensor so it doe'nt reset the peremiters.Then check all passages and lines in the intake manifold there could be a clogg somewhere.Go to www.rockauto.com and you'll find EGR pressure sensor for under $30.00.

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1 Answer

Maintanance required light on


turn the key to activate the power but not start the ignition, do this a handfull of times. The check engine light should blink a specific number of times, this can be referenced to identify the problem, after this happens the light should turn off until you have another problem!There's a difference between the "check engine" light and the "engine maintenance required" light (aka "Emission Maintenance Reminder" or EMR light). The EMR light is strickly a reminder that emission system maintenance is due. This includes the EGR valve, PCV valve, & Oxygen sensor. It is program to light at approximately 60,000, 82,500, & 120,000 miles. Because its activated by mileage, it does not necessarily mean that something has malfuction. Unfortunately, the only way to reset it is by using a diagnostic scan tool. Of course, you could always remove the bulb.

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