A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
SOURCE: 95 gmc jimmy engine codes
9141 does not exist I will assume it is DTC P0141 HO2S Heater Performance Bank 1 Sensor 2
The VCM has the capability to monitor this process by using the Heated
Oxygen Sensor (HO2S Bank 1, Sensor 2). The HO2S (Bank 1, Sensor 2), located
in the exhaust stream before the catalytic converter, produces an output signal
which indicates the storage capacity of the catalyst; this in turn indicates
the catalysts ability to convert the exhaust emissions effectively. If the
catalyst is functioning properly, the HO2S signal will be far less active
than the signal produced by the Heated Oxygen Sensor (Bank 1, Sensor 1).
When the HO2S temperature measures below 360°C (600°F), the
sensor will not produce any voltage and will behave like an open circuit.
This will result in an Open Loop operation.
The HO2S heater provides for a faster sensor warm-up which allows the
sensor to become active in a shorter period of time and remain active during
long extended idle. The DTC P0141 determines if the HO2S is functioning properly
by checking the response time of the sensor. This DTC is a type B DTC.
SOURCE: 1999 gmc jimmy 151k miles code 0452, emmissions help
THIS IS A FUEL TANK PRESSURE SENSOR CODE. MOST LIKELY THE SENSOR ITSELF IS BAD BUT CHECK THE WIRING AND THE ECM.
SOURCE: wath P1406 Code means on a GMC jimmy 1996,
It's an egr valve problem (exhaust gas return) egr position sensor.
Take off the egr valve and turn it over and see if there is carbon build up in the ports, if there is clean it out with a pipe cleaner and a little carbon cleaner, just spray a little into the ports and clean it out. If that doesn't cure the problem, then either the sensor needs replacing, and or the egr valve.
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