Question about Ford Escape

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2002 FORD ESCAPE ENGINE LIGHT CAME ON SCAN READS PO430 PO304 PO306

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P0304 Code - Cylinder #4 Misfire

A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4. FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook

P0306 Code - Cylinder #6 Misfire

A P0306 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6. FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook

Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present

Causes: A code P0304 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


P0430 Code - Catalyst System Efficiency Below Threshold (Bank 2)
Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms:
You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0430 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak

Possible Solutions:
- First, inspect for exhaust leaks.
- Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


Hope helps (remember rated and comment this).

Posted on Aug 04, 2010

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You most likely need a crank sensor thats the misfires the p0430 is caused by faulty 02 sensors change the sensors and clear the codes it will come back on a few more times just keep resetting it after 3 or 4 times it will not come back if you go to a mechanic they will sell you a cat for 400-600 bucks dont do it it is set to come on with other codes there is no sensor that tells you the cat is bad

Posted on Aug 04, 2010

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Cauases or fault codes are not cut and dry, but here are the possible causes of codes P0316 and P0306 which are related codes.
P0316 - Engine Misfire Detected on Startup
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Engine fails to start
- Engine runs rough Possible causes - Crankshaft Position (CKP) sensor harness is open or shorted
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Just bought a2001 Escape, looked good with 88k mileage, drove it home 100 miles, felt an occassional bucking/missing in the engine while driving, next day the engine light went on with the oil can...


Sounds like a problem with your catalytic converter or possibly just an o2 sensor. If it is a cat problem I would make sure to have them address it b4 your warranty is up as they are typically very expensive!

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The engine hesition sometime 04 expedition 5.4


Most likely you have a bad COP (Coil On Plug) .
Maybe more than one. Very common ford problem for last 12 years.
If you get a MIL Light on the dash (the wrench),check for a PO300 Code.
A PO304 would be coil #4,PO306 #6 Etc.
Cyl 1 thru 4 on pass side
Cyl 5 thru 8 on driver side,front to back

Also hills cause a hi engine vacuum and thus a possible EGR Valve going bad. You can unplug the vacuum lines and plug, to diagnose that issue.

Also leave the EGR disconnected if your working on coil issues. Just note the MIL light will stay on all the time,and remember to check your 300 codes if you feel a hesitaton or miss.

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Po306 po304 po300check engine light on how to fix problem


all trouble codes you have are miss fire codes p0304 #4 cyl p0306 #6 cyl p0300 random miss fire sounds like you may have bad spark plugs,wires,or coils

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After sitting in a parking lot for 1 week (2002 ford escape), check engine light came on


Go to Autozone or Oreillys for a free diagnostic scan. If you do it within 20-30 startups the info will still be in memory.

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