Question about 2003 Ford Focus
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Posted on Jan 02, 2017
To my knowledge, a 2003 Ford Focus 2.0 SPi engine would need 4 quarts of engine oil (roughly 3.78 liters). Incidentally, the Ford/Cosworth Zeta/Zetec engine would be needing 4.25 quarts (~4 liters).
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Posted on Jul 02, 2008
These codes are indicating engine misfires. 303 is cylinder #3 and 304 is cylinder #4. The 316 indicates that the misfire happened in the first 1000 revolutions.
These trucks are notorious for misfires. The most common issue is ignition coil failure. Failure on these coils can be accelerated though by spark plugs that are worn and contamination from oils, antifreeze leaks and water.
If it has been some time since you have replaced the spark plugs this may be an opportune time to do so. This job isn't for the faint of heart or those with little patience. Some of the coils and plugs are difficult to access, especially #7 and # 8. I also recommend torquing the spark plugs properly as there are some thread stripping issues on the spark plug threads with these engines.
Have at least 2 new coil assembly's for the two cylinders that are misfiring and be prepared to find at least one more that looks poor. I have used some aftermarket coils but have had issues with them. Ford has reduced the price on their coils to reflect a more fair market value so I would use those.
Have a look for any contamination issues and repair those to prevent future problems.
Hope this helps you along.
Posted on Nov 21, 2009
P174 means Oxygen sensor was slow in switching Single, Right
or Rear HO2S - Fuel control
P171 means Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control
for a comprehensive code listing for your car.
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Posted on Jan 08, 2010
Check and clean the MAF (mass air flow sensor). you will need a #20 anti-tamper torx bit and some carburetor cleaner. Be careful with the sensor it is delicate.
Posted on Apr 21, 2010
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