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Check engine lite
Ron, there should be a code if engine light is on,you can have a code stored without a engine light, but not possible to have a engine light without a code.
I am pretty sure, what ever code reader or scan tool you are using, is either faulty or not up to the job. Try a quality scanner, there will be a code.
a scan tool is used by a tech to find problems that the computer has detected or shows.one way is it will turn on the check engine light and set a code to help find the area to look for the problem and the other is a tech can look at the data that the computer sees while the engine is running or the car is being driven with the scan tool hooked up to the car.depending on what the problem is with the car it could cause a problem with the car if its driven without being checked into and repaired.often the problem is something that is considered easy to repair.have it looked into
Go to an Autozone, Checker, Shucks, Kragen, O'Reilly, or a NAPA auto parts store and ask them to use their code reader to find out what the trouble codes are causing your check engine light to come on. They will do this for no charge. Report back here once you know what the codes are.
Normally, the check engine light cannot be reset without a scan tool.
If you have a fault code stored in the memory, the cause for the code needs to be rectified. . You will need a scan tool hooked up to the car to clear the code, once the cause of the code has been repaired..
The P0442 is indicating a leak in the fuel tank vent system. As a first step, double check that the gas cap is secured properly and that the seal is in good shape. Often this code can be generated by a loose or leaking gas cap ..... or ..... running the engine with the gas cap removed.
Clear the fault code (using the fault code tool) and see if the code returns (check engine light comes back on). If the light comes back on, check the fault codes and if it is the same code, you do indeed have a leak. The only way to find the leak (other than a quick visual inspection of the system, which may or may not show an obvious leakage point), is to pressureize the system and inject a special smoke which will leak out at any leakage points. The smoke machine is a special tool.
You can't use a tool to pull codes from an '87 BMW 325(e). You have the 2.7 liter and your DME, or computer is a Motronic. If you had a 325i, then a tool could read the codes because the computer was upgraded that year to a Motronic 1.1 system with a round plug in under the screw cap on the driver's side under the hood. The only tool you can buy is the one for resetting the service interval light and resetting the oil change light. To answer your question about going about finding your driveability problem would be to get a BMW Bentley Manual. This manual shows you how to use a standard voltmeter to check everything from your computer plug in. Your computer is located above the glovebox.
1.) Don't do anything. Once the computer sees the engine run normally for a few cycles, it will automatically clear the code.
2.) Connect a scan tool to the OBDI port to clear the codes manually. Local auto parts stores will often perform scan tool diagnostics free of charge.
3.) If you want to remove the code quickly without any special tools, just disconnect the battery and leave it disconnected for a while. (How long varies for different cars, as some engine PCM's have capacitors that hold a charge for a short while after losing battery power.)