Fuel trim adaptation additive bank 1 malfunction on 1997 BMW 740iL

BMW Unmetered Air Leaks P0170 P0173 Mixture Too Lean ...

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www.youtube.com/watch?v=Eso0dgmymhYJan 2, 2013 - Uploaded by AskTheCarExperts BMW Unmetered Air Leaks P0170 P0173 Mixture Too Lean Smoke ... a lot thank you , damn boot was giving me so much problems and codes.

P0173 Fuel Trim Malfunction (Bank 2) - OBD Codes

www.obd-codes.com/p0173
Detailed information on troubleshooting and repairing a P0173 DTC code which refers to a fuel trim malfunction on Bank 2. Also includes links to relevant forum ...

P1174 - Fuel trim adaptive malfunction (Bank 1)
P1175 - Fuel trim adaptive malfunction (Bank 2)

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.

Diagnostic Test Code (DTC) P0171 is defined by SAE J2012 as "System Too Lean Bank 1".
This is what is known as a fuel trim code. Something is causing the fuel trim on bank 1 of your engine to reach a predetermined maximum set point. This can be caused by many things including vacuum leaks, malfunctioning injectors, a fauly mass airflow sensor, or even a catalytic converter that is clogged up.

If there are no fuel trim problems on the opposite bank, then there is a problem that affects only one bank. It is necessary to access the fuel trim data to correctly identify the problem. You may have fuel trim problems on the opposite bank that have not yet set a code. If the fuel trim data proves that there is no problem on the opposite bank, then this rules out several possiblities like the mass airflow sensor, as it will affect BOTH banks, not just one.

To put it simply: Proper diagnosis required.

P1102O2S Heating Circuit Bank 1 Sensor 1 Voltage Too Low/Air Leak
P1105O2S Heating Circuit Bank 1 Sensor 2 Short To Positive P1107O2S Heating Circuit Bank 2 Sensor 1 Short To Positive P1110O2S Heating Circuit Bank 2 Sensor 2 Short To Positive P1113O2S Sensor Heater Resistance Too High Bank 1 Sensor 1 P1115O2S Sensor Heater Circuit Short To Ground Bank 1 Sensor 1
P1116O2S Sensor Heater Circuit Open Bank 1 Sensor 1
P1117O2S Sensor Heater Circuit Short To Ground Bank 1 Sensor 2
P1118O2S Sensor Heater Circuit Open Bank 1 Sensor 2
P1127Long Term Fuel Trim B1 System Too Rich
P1128Long Term Fuel Trim B1 System Too Lean
P1129Long Term Fuel Trim B2 System Too Rich
P1130Long Term Fuel Trim B2 System Too Lean
P1136Long Term Fuel Trim Add. Fuel B1 System Too Lean
P1137Long Term Fuel Trim Add. Fuel B1 System Too Rich
P1138Long Term Fuel Trim Add. Fuel B2 System Too Lean
P1139Long Term Fuel Trim Add. Fuel B2 System Too Rich
P1141Load Calculation Cross Check Range/Performance
P1144Mass Air Flow Sensor Open/Short To Ground.
P1145Mass Air Flow Sensor Short To Positive.
P1146Mass Air Flow Sensor Supply Voltage.
P1155Manifold Absolute Pressure Sensor Short To Positive.
P1156Manifold Absolute Pressure Sensor Open/Short To Ground. P1157Manifold Absolute Pressure Sensor Supply Voltage.
P1160Intake Air Temperature Sensor Short To Ground.
P1161Intake Air Temperature Sensor Open/Short To Positive. P1162Intake Air Temperature Sensor Short To Ground.
P1163Fuel Temperature Sensor Open/Short To Positive.
P1164Fuel Temperature Sensor Implausible Signal.
P1171Throttle Actuation Potentiometer Sign. 2 Range/Performance P1172Throttle Actuation Potentiometer Sign. 2 Signal Too Low P1173Throttle Actuation Potentiometer Sign. 2 Signal Too High P1176Rear O2S Correction
P1177O2 Correction Behind Catalyst B1 Limit Attained
P1196O2S Heater Circuit Bank 1 Sensor 1 Electrical Malfunction P1197O2S Heater Circuit Bank 2 Sensor 1 Electrical Malfunction P1198O2S Heater Circuit Bank 1 Sensor 2 Electrical Malfunction P1199O2S Heater Circuit Bank 2 Sensor 2 Electrical Malfunction P1213Injector Circuit Cylinder 1 Short To Positive
P1214Injector Circuit Cylinder 2 Short To Positive
P1215Injector Circuit Cylinder 3 Short To Positive
P1216Injector Circuit Cylinder 4 Short To Positive
P1217Injector Circuit Cylinder 5 Short To Positive
P1218Injector Circuit Cylinder 6 Short To Positive
P1225Injector Circuit Cylinder 1 Short To Ground
P1226Injector Circuit Cylinder 2 Short To Ground
P1227Injector Circuit Cylinder 3 Short To Ground
P1228Injector Circuit Cylinder 4 Short To Ground
P1229Injector Circuit Cylinder 5 Short To Ground
P1230Injector Circuit Cylinder 6 Short To Ground
P1237Injector Circuit Open Cylinder 1
P1238Injector Circuit Open Cylinder 2
P1239Injector Circuit Open Cylinder 3
P1240Injector Circuit Open Cylinder 4
P1241Injector Circuit Open Cylinder 5
P1242Injector Circuit Open Cylinder 6
P1245Needle Lift Sensor Short To Ground
P1246Needle Lift Implausible Signal
P1247Needle Lift Sensor Open/Short To Positive
P1248Start Of Cold Start Injector Control Difference
P1251Start Of Cold Start Injector Short To Positive
P1252Start Of Cold Start Injector Open/Short To Ground
P1255Engine Coolant Temperature Sensor Short To Ground
P1256Engine Coolant Temperature Sensor Open/Short To Positive P1300Misfire Detected, Fuel Level Too Low
P1250Fuel Level Too Low P1325Cyl. 1 Knock Control Limit Attained
P1326Cyl. 2 Knock Control Limit Attained
P1327Cyl. 3 Knock Control Limit Attained
P1328Cyl. 4 Knock Control Limit Attained
P1329Cyl. 5 Knock Control Limit Attained
P1330Cyl. 6 Knock Control Limit Attained
P1336Engine Torque Adaption At Limit
P1337CMP Sensor Bank 1 Short To Ground
P1338CMP Sensor Bank 1 Open Circuit Or Short To Positive P1340CKP/CMP Sensor Signals Out Of Sequence
P1341Ignition Coil Output Stage 1 Short To Ground
P1343Ignition Coil Output Stage 2 Short To Ground
P1345Ignition Coil Output Stage 3 Short To Ground
P1354Modulating Piston Displacement Sensor Electrical Circuit Malfunction
P1386Internal Control Module Knock Control Error
P1387Control Unit Internal Altitude Sensor
P1391CMP Sensor Bank 2 Short To Ground
P1392CMP Sensor Bank 2 Open Circuit/Short To Positive
P1393Ignition Coil Power Output Stage 1 Malfunction
P1394Ignition Coil Power Output Stage 2 Malfunction
P1395Ignition Coil Power Output Stage 3 Malfunction
P1401EGR Valve Power Stage Short To Ground
P1402EGR Vacuum Regulator Solenoid Valve Short To Positive P1403EGR System Control Difference
P1407EGR Temperature Sensor Signal Too Low
P1408EGR Temperature Sensor Signal Too High
P1410Tank Ventilation Valve Circuit Short To B+ P1420Secondary Air Injection Control Module Electrical Malfunction P1421Secondary Air Injection Valve Circuit Short To Ground P1422Secondary Air Injection Valve Circuit Short To B+ P1424Secondary Air Injection System Bank 1 Leak Detected P1425Tank Ventilation Valve Short To Ground P1426Tank Ventilation Valve Open Circuit P1432Secondary Air Injection Valve Open P1433Secondary Air Injection Pump Relay Circuit Open P1434Secondary Air Injection Pump Relay Circuit Short To Positive P1435Secondary Air Injection Pump Relay Circuit Short To Ground P1436Secondary Air Injection Pump Relay Circuit Electrical Malfunction P1440EGR Valve Power Stage Open P1441EGR Vacuum Regulator Solenoid Valve Open/Short To Ground P1450Secondary Air Injection System Circuit Short To Positive P1451Secondary Air Injection Circuit Short To Ground P1452Secondary Air Injection System Circuit Open P1471EVAP Control System LDP Circuit Short to Positive P1472EVAP Control System LDP Circuit Short To Ground P1473EVAP Control System LDP Open Circuit P1475EVAP Control System LDP Malfunction/Signal Circuit Open P1476EVAP Control System LDP Malfunction/Insufficient Vacuum P1477EVAP Control System LDP Malfunction P1478EVAP Control System LDP Clamped Tube Detected P1500Fuel Pump Relay Electrical Circuit Malfunction P1501Fuel Pump Relay Circuit Short To Ground P1502Fuel Pump Relay Circuit Short To Positive P1505Closed Throttle Position Does Not Close/Open Circuit P1506Closed Throttle Position Switch Does Not Open./Short To Ground P1512Intake Manifold Changeover Valve Circuit Short To Positive P1515Intake Manifold Changeover Valve Circuit Short To Ground P1516Intake Manifold Changeover Valve Circuit Open P1519Intake Camshaft Control Bank 1 Malfunction P1522Intake Camshaft Control Bank 2 Malfunction P1537Fuel Cut-off Valve Incorrect Function P1538Fuel Cut-off Valve Open/Short To Ground P1539Clutch Pedal Switch Signal Fault P1540VSS Signal Too High P1541Fuel Pump Relay Circuit Open P1542Throttle Actuation Potentiometer Range/Performance P1543Throttle Actuation Potentiometer Signal Too Low P1544Throttle Actuation Potentiometer Signal Too High
P1545Throttle Position Control Malfunction P1546Wastegate Bypass Regulator Valve Short To Positive P1547Wastegate Bypass Regulator Valve Short To Ground P1548Wastegate Bypass Regulator Valve Open P1549Wastegate Bypass Regulator Valve Open/Short To Ground P1550Charge Pressure Control Difference P1555Charge Pressure Upper Limit Exceeded P1556Charge Pressure Negative Deviation P1557Charge Pressure Positive Deviation P1558Throttle Actuator Electrical Malfunction P1559Idle Speed Control Throttle Position Adaption Malfunction P1560Maximum Engine Speed Exceeded P1561Quantity Adjuster Control Difference P1562Quantity Adjuster Upper Stop Value P1563Quantity Adjuster Lower Stop Value P1564Idle Speed Control Throttle Position Low Voltage During Adaption P1565Idle Speed Control Throttle Position Lower Limit Not Obtained P1568Idle Speed Control Throttle Position Mechanical Malfunction P1569Switch For CCS Signal Faulty P1580Throttle Actuator B1 Malfunction P1582Idle Adaptation At Limit P1600Power Supply Terminal No. 15 Low Voltage P1602Power Supply Terminal No. 30 Low Voltage P1603Internal Control Module Self Check P1606Rough Road Spec. Engine Torque ABS-ECU Electrical Malfunction P1611MIL Call-Up Circuit/TCM Short To Ground P1612Engine Control Module Incorrect Coding
P1613MIL Call-Up Circuit Open/Short To Positive P1616Glow Plug Indicator Lamp Short To Positive P1617Glow Plug Indicator Lamp Open/Short To Ground P1618Glow Plug Relay Short To Positive P1619Glow Plug Relay Open/Short To Ground P1624MIL Request Signal Active P1626Data Bus Drive Missing Command From M/T P1630Accelerator Pedal Position Sensor 1 Signal Too Low P1631Accelerator Pedal Position Sensor 1 Signal Too High P1632Accelerator Pedal Position Sensor 1/2 Supply Voltage P1633Accelerator Pedal Position Sensor 2 Signal Too Low P1634Accelerator Pedal Position Sensor 2 Signal Too High P1639Accelerator Pedal Position Sensor 1/2 Range Performance P1640Internal Control Module (EEPROM) Error P1648CAN-Bus System Component Failure P1649Data Bus Powertrain Missing Message From Brake Controller P1676Drive By Wire MIL Circuit Electrical Malfunction P1677Drive By Wire MIL Circuit Short To Positive P1678Drive By Wire MIL Circuit Short To Ground P1679Drive By Wire MIL Circuit Open Circuit P1681Control Module Programming Not Finished P1686Control Unit Error, Programming Error P1690MIL Malfunction P1691MIL Open Circuit P1692MIL Short To Ground P1693MIL Short To Positive P1778Solenoid EV7 Electrical Malfunction P1780Engine Intervention Readable P1851Data Bus Drive Missing Command From ABS P1854Drive Train CAN-Bus Inoperative

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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

Explanation:

According to my research and the BMW master mechanic, basically your oxygen sensor is getting an abnormal reading. The abnormal reading will result in the sensor being unable to adapt beyond its +/- 10% threshold to adapt for the fuel/trim mixture. Therefore, either your car is going to run too lean (not enough fuel) or too rich (too much fuel).

Problems:

1) Either your pre-cats oxygen sensors are bad.
2) Fuel pressure regulator
3) Leak in the air intake /vacuum system
I would think that it is probably your oxygen sensors. Replace that and you should be good to go. Thanks for rating my response and for using FixYa!

Sounds like it may be running a bit lean - do basic checks for air leaks in the induction system (such as leaking manifold gasket, loose hose fittings to air flow sensor etc).
Condition of HT leads also worth a check.