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Where is the knock sensor located on a 2004 Ford Freestar with the 4.2 engine?

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The knock sensor is installed in the lower forward area of the block on an OHC V6 engine.
I believe another option to the knock sensor is the "Mass Air Flow Sensor" That would be easy to see from the top side of engine on the Air Inlet tube on the Throttle Body.


Where is the knock sensor - knock-sensor-a2riyopt1s5x3ufgaulzsjwa-5-0.jpeg

Posted on Oct 20, 2016

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Posted on Jan 02, 2017

autodr
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SOURCE: Cleaning the Mass Air Flow Sensor

i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.

Posted on Nov 15, 2008

Molson02536
  • 3854 Answers

SOURCE: where is the gas filter located on a 2004 ford

It is underneath the van on the driver's side near the rear edge of the driver's door. Follow the fuel line coming out of the gas tank to it. It's about the size of a coke can, If you have not picked up the fuel filter yet, Auto Zone will have it and can give you the step by step instruction to get the job done and can lone you the quick release wrench for the fuel line to the fuel filter. Good luck and keep me posted. Be glad to help.

Posted on Jun 20, 2009

  • 4369 Answers

SOURCE: 2004 Ford Freestar with P0340 Code. What is it

camshaft position sensor

Posted on Jan 16, 2010

  • 212 Answers

SOURCE: where is knock sensor located on 2004 chevy 2500Hd

Under intake manifold on top of block,you need to remove intake to access sensors there are two of them you can't miss them when intake is off. After replacing sensors you need a new intake gasket.

Posted on Apr 04, 2010

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Need the code PO722 for a 2006 ford freestar 3.9


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Where is the o2 sensor on 2005 ford freestar 3.9


o2sensors are located in the exhaust system.you have 4 o2sensors on your car.so you need to know which sensor your looking for.bank 1 sensor 1 is the first sensor in the exhaust pipe on the side cylinder 1 is on.bank 2 is on the side cylinder 2 is on.then you have a sensor before the catalytic convertor and one after the convertor.

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I have a 2004 Freestar and had the oil changed and it immediately started misfiring and knocking, come to find out they put the wrong oil in and have been doing so for 4 years! They are denying that is the...


The type of oil in the engine will not affect the check engine light. The engine light only comes on when something in the engine management system is out of specifications. Any sensor reading out of specification, e.g. oxygen sensor, mass air flow sensor, throttle position sensor etc., will trip the engine light. The only way I can think that the oil changers could be responsible is if they moved or damaged some wiring or a sensor etc. while doing the oil change.

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Sensor location


here is where it is on 2003 Windstar. I don't have Freestar.

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Mar 09, 2009 | 2004 Ford Freestar

1 Answer

Cleaning the Mass Air Flow Sensor


i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.

Nov 15, 2008 | 2004 Ford Freestar

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