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P codes

Tiny
ZACHEVANS18
  • MEMBER
  • 2001 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 137,100 MILES
My check engine light has been on. Bought a code reader. Hooked it up and I got 8 faults. Here are my codes P0300 - P0306, which are my cylinders and it is strange because I just replaced my spark plugs. So I'd like a few opinions on that if you could. And also my 2 othere codes are P0121 and P1281. If I can have your help that'd be great. Thank you
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Saturday, April 16th, 2016 AT 1:48 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If it didn't do it prior to replacing the spark plug s check wires with an ohm meter and recheck your plugs for cracking on porcelain. Wires shold be 5000 ohms per foot see pics for code 121 and 1281 means engine is cold to long check your coolant level youmayhave a head gasket leak.
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Saturday, April 16th, 2016 AT 3:34 PM

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