P codes

2001 JEEP GRAND CHEROKEE
137,100 MILES • 4.0L • 6 CYL • RWD • AUTOMATIC
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ZACHEVANS18
  • MEMBER
  • 1 POST
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
Apr 16, 2016 at 6:48 AM
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HMAC300
  • ✓Experienced 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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Apr 16, 2016 at 8:34 AM
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