1998 Nissan Truck DTC P0300 & P1148??

1998 NISSAN TRUCK
98,000 MILES • 6 CYL • FWD • AUTOMATIC
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MURUSA
  • MEMBER
  • 1 POST
Hello,

I have Quest. When I got "Service engine soon", I checked with OBD II code reader. Im getting P0300 (Random/Multiple cylinder misfire detected) and P1148 (Closed loop control bank). What is the meaning of these codes? How much aproximately it might cost to repair if i take to mechanic??. Thx in advance.
Oct 29, 2008 at 9:25 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
For a start get the oxygen sensors checked and for vacuum leaks-

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel
Oct 29, 2008 at 10:35 AM
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