Question about 2008 Jeep Patriot

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Reset check engine light

Check engine light stays on

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  • Jeep Master
  • 20,706 Answers

We get it serviced,? or better, SCAN it>? !!!!
but all cars with EFI, from ~1988 to now, (about) the PCM
is reset , by 3 ways,
1: scan tool reset. push the button, bingo.
2: pull the PCM memory fuse for 5min (now called, IOD )
3: pull battery NEG lug, and this bricks Radio, NAV and all things with learn mode, just forgot and the "entanglements there of"


posted like 1000 times here, so 1001.
if repair, PCM,s so this is my bag (jones), (retried)


easy as 1,2,3,
#2 is free, not a dime of cost. or risk of done correct.
if only PCM IOD is pulled. mine has 6 OIDs, the PCM is the correct one.

Posted on Jan 28, 2015

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Posted on Jan 02, 2017

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SOURCE: 2003 Jeep Grand Cherokee check engine light stays

go to autozone they will check codes for free

Posted on Jul 23, 2009

  • 6982 Answers

SOURCE: check engime light comes on and off

If you hear any ticking or knocking inside the engine do not drive it. You could change the oil pressure sending unit if there's no noise, most times that will fix the problem. It is advisable to put an external mechanical pressure gauge on there, either temporary or permanent...then, you can read the actual pressure...
I prefer gauges to lights because most time lights (either temp or oil) tell you "you have just blown your engine", instead of warning you when a problem is just beginning.

Posted on Sep 24, 2009

  • 6982 Answers

SOURCE: I have a 97 wrangler

Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

Posted on Mar 24, 2011

meinverstand
  • 181 Answers

SOURCE: My check engine light came on code P0446;

No, there is a problem with the EVAP system. If you have already tightened the gas cap and reset the check engine light with a scanner then your next step is to check for leaks between the fuel tank and the engine, this could be something as simple as a loose fitting at the fuel filter or something much more complex that would require a mechanic to test the entire fuel system.

Posted on May 04, 2011

richierich66
  • 10 Answers

SOURCE: check engine light stays on

you need to use a obd2 scan tool to find out the error message for why it is on.then you can fix the problem

Posted on Aug 12, 2012

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