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Posted on Feb 17, 2009
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2002 Sable LS 43,000 miles. Check Engine light on again!

2002 Sable LS 43,000 miles. Check Engine light on again, just replaced the bad ignition coil and wires and plugs 6 months ago. there are no performance effects yet. have refilled the gas tank 5 times since light came on... Help

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  • stockdream Feb 26, 2009

    PEP BOys pulled 2 codes 172 and 175 running rich bank 1 and bank 2.

  • stockdream Feb 26, 2009

    PEP BOYS read the codes for Free, got 2 codes P0172 and p0175. rich bank 1 and bank 2. the guys stated but wasn't sure it was an Oxygen sensor. what do the experts say. how hard to replace?

  • Anonymous Mar 30, 2014

    plugs, ignition harness,coil tower,fuel pump,and filter changed by ford certified shop.check engine light appeared after 32 miles.shop cleared cel but it reappeared shortly, car runs very good.

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  • Posted on Feb 17, 2009
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Without a fault code its impossible to diagnose. try pep boys or aamco or auto zone they will pull the code for you, usually for free. The code will relate to a sensor or area to be fixed. This will save you money and needless parts . post the code or codes so we can help

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Engine rpm surges intermitently

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Which ignition coil is bad?
I went thru this on my 2002 LS as well.
I replaced one ignition coil at the dealer - only to get the same misfire code on another cylinder. After a little research found out is actuall a gasket/o-ring problem design of the block. Spark plugs are deep in the block - under the oil - which is why they are supposed to last 100,000 miles. But the o-rings start to leak some where between 65k-85k miles. Coils go bad because of oil contamination. If you don't solve leaking oil problem will have to replace coils again - but sooner - because leaking oil will be progressively worse.
Cost - 8 ignition coils
set of spark plugs (who knew they were that expensive
and a ton of cash for the labor to tear down the top of the motor
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