I have an OBD 2 code reader, it gives abbreviated descriptions. I'm looking for information describing exactly what each code means. Right now I'm getting 6 codes, P0300, P0133, P0301, P0303, P0304, P1399 on my '98 Civic LX, 1.6 liter. The car starts ok, but sputters bad on acceleration. I already changed the timing belt and fuel pressure regulator, I rechecked the timing marks and they line up correctly.

What vehicle. If you have a code reader you can delete the code. Then see "if" it comes back on or how long before it comes back on?
I have one on my van that comes on every couple of months. I turn it off to get it smogged every 2 years. Then just leave it on & off as it wants to be. The funny part is. My van runs better and I get much better gas mileage when it is on.

That's me though.
What vehicle do you have. How long has it been on?

You need to plug a OBD 2 code reader into it this read all codes and give you a place to start most of the time its a sensor that's how the system works the computer isn't all knowing the sensors give it information that tells it what to do

C2100 Engine Fault Code Check Solution For C2100 OBD Code : C2100 engine code seems a kind of chassis problem, we try to show one by one the meaning and the solution.
Brief explanation of the C2100 code and definition of C2100 is the bottom side.

C2100 Meaning :

c Chassis Code
Problem is controller area network wiring bus and modules. 2 MFG - Manufacturer Specific 1 BBV Sensor Circuit Low Voltage 0 Low Coolant Circuit 0 Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit MFG - Manufacturer Specific codes, which have a '1' as their second digit to indicate they are unique to a particular vehicle make or model. These special codes were deemed necessary by the vehicle manufacturers so they could provide additional diagnostic information beyond the basic list of generic OBD II codes for all kinds of faults, not just emissions-related faults.

How To Fix C2100 ?
There are currently two main types of cylinder deactivation used today, depending on the type of engine. C2100 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed. C2100 Code Description: The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions. When you see C2100 engine fault code on your engine code reader this description will help you.
C Codes List of all Chassis codes. Final Step: In the definitions listed below, there is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the C Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.

if u have a code reader there is a code look up option on all obd readers go to the code lookup type in your code and it will give u a description of code if u don't have a scanner any auto parts store will scan for free.

Need to get a can of gumout and with it idling spray around the top of the upper plenum to see if you have a vacuum leak if you have a leak it will either idle up slightly or kill the engine very very common on the 3.0 Taurus ,little more information would be helpful like how many miles are on the car

need to have the fault code pulled to see what sensor is setting the light on. autozone or advance autoparts will pull the codes for you. be sure to get the code number and brief description of code to help in diagnosing the problem.

P0751 Shift Solenoid A Performance or Stuck Off (generic OBD description)
P0715 Input/Turbine Speed Sensor Circuit Malfunction

The service manual does not list P0751 as a valid code for your vehicle. You may want to re-check it to make sure you are reading it correctly. Also note that many generic OBD code readers cannot give complete renderings of "manufacturer-specific" codes. You may be getting this code if you are using a generic OBD code reader because there is a manufacturer-specific code present and P0751 is the closest "generic" rendering of the code that the code reader could find.

P0715 is a CIRCUIT malfunction. NO, this does not mean that your transmission needs to be overhauled. This means that either the turbine speed sensor has an electrical failure in itself or the circuits between the turbine speed sensor and the computer are defective. Electrical diagnosis needs to be done.

Please note that BOTH of these codes can be cause by low battery voltage and attempts to diagnose the circuits involved should only be done AFTER verifying that the battery and charging system is working properly.

That is a actually a side view of an engine, which is called a CEL ( Check Engine Light) and it will be lit up Orange in color. When it lights up it means the (ECM) Computer in the car is telling you that it has received a Trouble Code from a sensor or engine component and you need to have a OBD II (On Board Diagnostic II ) scanner or code reader hooked up to the Diagnostic Port located under the driver's side footwell. The reader will extract a specific code from the computer which a mechanic will look up and they can determine what component needs to be repaired or replaced. You can go to any AutoZone store and you can have the code read for free. Click on the link below for more information pertaining to this event.
http://www.obd-codes.com/

P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

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To query and OBD-I-era computer for these codes, put the key in the ignition and turn the key to run (not start), then off, then run, then off, then run (that's 3 runs and 2 offs). Leave the key in the run position.

The check engine light will turn on for a few seconds, then turn off, then (sometimes after 20-30 seconds) start flashing. The flashes are counting out 2-digit trouble codes. Fast flashes count up each digit, with a longer pause between digits. On TJ's with a digital odometer, the code numbers are printed on the odometer in addition to flashing the check engine light. 55 indicates the end of all codes. Once you've got your code list, consult the table below to see what they mean.

OBD-II information is more complex, so the codes for 1998 and newer Jeeps can't be displayed by flashing the check engine light. However, those vehicles which have digital odometers will display the codes on the odometer. I've verified this personally on a 1999 WJ. For those vehicles without digital odometers, or for anybody who wants an English description rather than just a numeric code, an OBD-II code scanner ($100-300) can be plugged in under the dash. OBD-II codes can be looked up online here.


These codes were taken from the '95 XJ/YJ factory service manual.

I hope help you woth this. Good luck (rated this).