I have a 97 5 series bmw that has a bank 1 fuel trim code i have checked the elbow from the t.b. , all vac lines and cant seem to locate the problem. i have sprayed t.b. cleaner around everything to no avail any help would be greatly appr.
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P0300 is a random miss fire , a vacuum leak can cause this as well as low fuel pressure ! weak fuel pump , clogged fuel filter !
DTC P0171: Fuel Trim System Lean Bank 1
DTC P0174: Fuel Trim System Lean Bank 2 These two codes are saying the PCM - engine computer is see a lean condition .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor.
You don't say what make , model an year vehicle ! These are for GM vehicles , yours could mean something else . Except the first three , those are genaric codes , same for all makes ! So can't say what this codes are P2097, and P2099 ! Can't mean this P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2
bank 2 sensor 1 is a heated oxygen sensor in the manifold or exhaust before the cat converter
it is not an o2 sensor which is oxygen sensor after the cat converter for bank 2
two completely different sensors
the fuel trim code appears because of the problem sensors
the fuel trim is cpu program in the computer in the ECM setting a optimum fuel /air ratio after a period of driving
if the sensors both HO2s and O2 sensors are faulty then the cpu cannot set the fuel trim
Code P0170 indicates a bank 1 fuel trim problem. Probable causes:
1. Faulty sensor or solenoid
2. Control unit software needs updating
3. Faulty PCM or ECM
4. Fuel pressure problem. Check pump, regulator,filter, and lines
You have a small air leak. The fuel trim kept increasing to compensate until it exceeded the allowable range. Change the valve cove gasket and valve cove bolt gaskets. check for leeks around intake manifold.
I would check for a vacuum leak somewhere. Like the post for the pcv hoses and elbows to the intake manifold gaskets not sealing. Check with at scan tool the fuel trims to see how the engine is running. If the long term fuel trim is over 10 % then there is a vacuum leak. It is rare for a lean running bank and at the same time a rich running bank. The only thing that could be possible cause for that would be the mass air flow sensor or the hose to the throttle body is not sealing causing unwanted air to get passed the MAF. These engines have a problem when it is cold the manifold gaskets not sealing and then when the engine is warm to seal and the fuel trims be high when cold and then be normal after it warms up
P0304 = #4 cylinder misfires P0170 = Fuel Trim, Bank-1
P0173 = Fuel Trim, Bank-2 P1250 = this is invalid code for BMW
P1188 = Fuel control, bank-1, sensor-1 (pre-cat sensor)
P1189 = Fuel control, bank-2, sensor-1 (pre-cat sensor) Vacuum leaks and/or sensor defective for the issues of the codes. This error codes really need parts to replace. But you have to replace the thermostat first. Then clear the codes and see if any reappears,then replace defective part/s
Im going throught this problem also P1477 code on my E46/99 bmw 328i, also dont forget to check all the vacume lines, it is very common on this car that the hoses they use go rotten very quick, along with the intake tubes or elbows, i found massive holes on my mine also many vacume lines damaged, i still have the 1477 code, but ive seen various post were people swapped the fuel breather valve, i checked all the canister tours the rear of the vehicle, they all seemed fine , no broken lines, everything is tight but the fuel breather valve its only between 80 to 100$, compare to the 350$ canister... go figure, and its fixed quite a few cars, so ill give it try, wipe the codes, and hope it doesnt come back, good luck....
fuel trim adaption additive bank 1 malfunction this means that the intake manifold gasket may be leaking or plug cap and the vacuum hose for the fuel pressure regulator hose maybe torn or missing check these look for leaks backside motor be black gunk all around them and check the hose