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2004 Sentra 1.8 S "Service Engine Soon" Light is ON Forums > > 2004 Sentra 1.8 S "Service Engine Soon" Light is ON 2004 Sentra 1.8 S "Service Engine Soon" Light is ON
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  #1  
Old 04-04-2007, 08:47 PM
amoldc
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Question 2004 Sentra 1.8 S "Service Engine Soon" Light is ON

Hello ....

This is a 04 Nissan Sentra with 40 K miles on it. I have always done the maintenance regularly including scheduled maintenance. Yesterday I had to jumpstart my car and took it to a repair shop. He replaced the battery and when he test drove; the car suddenly stopped and Brake and Service Engine Lights Came on. The alternator was overcharging; so it got replaced; now when the mechanic started the car again; we got the Airbag and Service Engine Light ON. He reset it with a SnapON OBD. However the Service Engine Light is still ON. I dont remember the code; but my mechanic suggested me to drive it for around 100 miles and it should go off. I have driven around those many miles and "Service Engine Soon" Light is still ON.

What could be the reason?

Also do alternators go bad in these many miles (40k?)
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  #2  
Old 04-11-2007, 05:21 PM
FieldRun
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I don't know the typical life of an alternator, but surely it must be much longer than 100,000 miles. Failing at 40K is much too soon. Possibly a belt was too tight or possibly a failure of the voltage regulator. I wouldn't doubt a faulty voltage regulator causing the battery failure and alternator problem. If you have a voltmeter, consider downloading the free manual on this site and go to the charger circuit tests. This may also be the cause of the Brake and Service engine light to come on. Otherwise, bring the car to a trusted mechanic. Good luck.
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  #3  
Old 04-23-2007, 05:55 PM
c_hayhurst
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Very interesting. I have the exact same problem with my 2004 Sentra 1.8 S! It had 67,000 miles on it.

I had AutoZone hook up a diagnostic computer to it and gave back a statement to the effect of, "There may be something wrong with your car, or maybe not". I'll let you know exactly what it said if I can find the printout.

You may take your car to an AutoZone or Advance Auto Parts and see if they will hook up a diagnostic computer for free (it should be free).
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  #4  
Old 04-25-2007, 02:37 AM
Gomer
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Alternators have been known to go within a half hour of installation. If it's bad, don't be surprised.

The alternator may not be the only problem with the car. The mechanic recommended driving 100 miles because it seems a decent distance for readiness codes to reset. So far, 25 states and the District of Columbia have made the switch to OBD II testing. These include Alaska, Arizona, California (in areas that require "enhanced" emissions testing), Colorado, Connecticut, Georgia, Illinois, Indiana, Kentucky, Maine, Massachusetts, Missouri (St. Louis), Nevada, New Hampshire, North Carolina, Oregon, Texas (Houston and Dallas/Ft. Worth), Utah (Salt Lake City), Vermont, Washington and Wisconsin. In 2004, New Jersey, New York, Pennsylvania (Pittsburgh and Philadelphia) and Virginia added OBD II testing.

To help ensure the OBD system is working properly, “readiness codes” are used to indicate whether or not monitored emissions control systems have been tested by the OBD system. Each emissions control system has its own monitor and related readiness code. If any of the readiness codes are set to "not ready" or "not complete," the OBD system has not yet completed testing of that particular component or system. A component failure may exist, but has not yet been identified because the system testing has not been completed.

An OBD II test is a simple plug-in computer check that verifies four things:
  1. The Vehicle Identification Number (VIN).
  2. That the vehicle's OBD II system is ready (all required readiness monitors have been set).
  3. The status of the MIL lamp. The lamp must be functioning correctly and come on when commanded to do so. Otherwise, it must be off, indicating no codes.
  4. That the vehicle has no diagnostic trouble codes that would cause the MIL lamp to come on.

Unfortunately, when readiness codes reset, so do error codes. Skip the guy with the Snap On code reader and go to someone with a diagnostic computer with two way controls. They should be able to test out the ECM and it's subordinate systems to find out exactly what the problem is. Best place to find one? A dealership. If it isn't free, and it should be, it'll be cheap.
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  #5  
Old 04-25-2007, 02:56 AM
c_hayhurst
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Quote:
Originally Posted by Gomer View Post
Best place to find one? A dealership. If it isn't free, and it should be, it'll be cheap.
A local mechanic and the NIssan dealership wanted to charge $70 and $80, respectively, to run a diagnostic test on the car using their machinery. Is that in line with what you are thinking?
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  #6  
Old 04-27-2007, 01:17 AM
Gomer
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$70-$80 isn't bad, but it's been cheaper; sounds about right for a dealership. The guy I take my cars to when I need to farm out work charges $35.
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  #7  
Old 02-03-2008, 10:10 AM
clarawilliamson
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I own a 1994 Nissan Sentra. I have replaced several alternators. Where is the farmed out guy in North Carolina?? I would like to have may OBD system checked.
Thanks

Clara
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  #8  
Old 02-03-2008, 10:11 AM
clarawilliamson
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Talking

I own a 1994 Nissan Sentra. I have replaced several alternators. Where is the farmed out guy in North Carolina?? I would like to have may OBD system checked.
Thanks

Clara
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  #9  
Old 02-08-2008, 09:52 AM
RugerRedhawk
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Go to advance auto and have them scan your check engine light. Make sure they give you the printout with the code on it. It's free. You can also have them clear the codes. Sometimes when they clear them, they don't come back. Post the trouble code here and we can narrow down the problem for you.
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  #10  
Old 11-15-2012, 04:48 PM
hyd hyd is offline
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Default check engine light nissan sentra 04

i brought my nissan sentra 1.8s to advanced auto parts because my check engine light is on. they did an engine analysis on it and there was 2x4 codes and they had no idea what they ment. the codes are; u1001, p1122, p0462, p1126. if anyone knows what these codes mean and how to fix please tell me.
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  #11  
Old 11-15-2012, 07:48 PM
JudoJohn JudoJohn is offline
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here is a link to the codes;

OBD II trouble codes. - B15sentra.net - Nissan Sentra Forum
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