Question about 2002 Ford Focus

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2002 Ford Focus, driving down road, airbag light comes on, dashlights go out, engine runs rough then quits. Restarts, goes one block, quits again.

Driving down road, airbag light comes on, dashlights go out, engine then runs rough and quits. restarts, goes a block and quits again.

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Symptoms of a charging system problem. The charging system comprises the alternator, battery and associated wiring. If the alternator should fail to produce a sufficient or stable enough voltage for the car's electronic systems - due to a wiring short, faulty voltage regulator, or corroded electrical connector, for example - the car will run off the "reserve" in the battery for a short time until the battery is eventually depleted. (The battery itself could also contribute to the problem if it has a faulty cell or for some reason is causing the alternator to put out an excessively high voltage in an attempt to compensate.)

So a couple of quick checks: Measure the battery voltage with the car off. Yours sounds like it will be dead; the clicking while attempting to start is the starter relay not getting enough juice. Then the question becomes: Is the battery dead because of age (fails to hold a charge) or because the alternator isn't charging it? To answer this question, measure the voltage at the battery with the car running. (Jump it or substitute a known good 12V battery.) You should see 14+V. If you only see 12V or less, you're seeing only the current battery charge without any contribution from the alt.

Finally, don't assume because the alt isn't putting out anything the alt is at fault. The wiring harness and electrical connector to the back of the alt should be thoroughly examined. (The wiring connector is a known failure point on early models.) The wiring harness should obviously show no signs of burning, melting or chafing and the battery terminals should be corrosion free and tight. If the harness checks out, remove the alt and have it bench tested. Rebuilding usually gives better long term reliability than chain store bought reman units, I'm told.

Long story short, I suspect the voltage regulator in your alternator failed, the battery gave it's all trying to keep your car running, finally gave up and now you have a dead alt and a dead battery. Don't just install a new battery without doing the alternator voltage output tests.

If you're really lucky it could be as simple as loose or corroded battery terminals.

Posted on Apr 18, 2013

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Posted on Jan 02, 2017

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SOURCE: 2004 Ford Focus LX, was sputtering while driving

change the fuel filter. and clean the mass air flow sensor usein a can of carb cleaner from any parts shop. depending on the miles on your car the timing belt mit have jumped a tooth. have to change it every 120.000 km.

Posted on Apr 25, 2010

  • 1 Answer

SOURCE: 2002 Ford Focus - Idles

Vac elbow had small crack in it - replaced the elbow and the car runs great

Posted on Aug 13, 2008

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SOURCE: 2002 Ford Focus

you will have to read the diagnostic code that the computer is sendig for the check engine light to activate

Posted on Sep 30, 2008

wyatt1582
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SOURCE: Engine stalling Ford Focus 1.8 TDCi year 2002,

EGR Valve and dpfe sensor control idle.

Posted on Nov 05, 2009

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SOURCE: 2ooo ford focus runs rough no power while driving

basic troubleshooting should give you a better idea of what the problem could be like fuel pressure, restricted exhaust timing issued due to timing belt skiping teths. would recommend getting it to a shop.

Posted on Feb 18, 2010

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