BMW 009319: KOMBI Tank Sensor 1 Fault Diagnosis and Repair

009319 means the KOMBI instrument cluster has detected a fault involving tank sensor 1. The sender reports fuel level through a float and electrical track, while the cluster evaluates that signal with the second sender and calculated consumption. The code identifies one measurement path; it does not automatically condemn the complete fuel-pump module. What Does BMW 009319 Mean? Tank sensor 1 measures fuel height in one chamber of the shaped BMW tank. On vehicles with two senders, KOMBI combines both values to calculate the gauge position and remaining range. A stuck float, worn resistor track, open connector, damaged wire, or implausible chamber relationship can therefore set 009319. The exact sender location and signal routing vary by chassis, tank design, and module generation. Some BMWs pass the value through another body controller before KOMBI displays it. Confirm the VIN-specific wiring diagram and ISTA test plan, then compare raw sender values rather than assuming that sensor 1 always occupies the same physical side. Code: 009319 Definition: KOMBI: Tank sensor 1 Module: KOMBI instrument cluster Key data: tank sensor 1 compared with sensor 2 and calculated consumption Typical cause: interrupted sender path or worn resistive track Severity: unreliable fuel level and remaining range Note: confirm tank layout and wiring by VIN Record both sender channels before disturbing the connector. One frozen channel beside a changing second channel is stronger evidence than the dashboard gauge alone. What Symptoms Does BMW 009319 Cause? The fuel gauge may jump after a bump, remain fixed after refueling, fall suddenly, or show a range that disagrees with fuel added. A scan can show tank sensor 1 frozen while sensor 2 and calculated consumption continue changing. Intermittent open-circuit behavior often appears as sharp steps rather than a smooth level change. • The fuel gauge jumps abruptly after bumps instead of moving gradually as fuel is consumed. • Displayed range remains fixed even though mileage increases and the second sender value changes. • After refueling, tank sensor 1 shows little or no response while sensor 2 rises. • The low-fuel warning appears too early, too late, or inconsistently for the known fuel quantity. • Live data contains sharp sender steps or an impossible fixed value at one tank level. • The engine may run normally because 009319 concerns level measurement, not fuel-pressure delivery. Why Does BMW 009319 Occur? 009319 usually begins with a poor connector, strained tank-top harness, corroded terminal, or float obstruction. Wear on the sender's resistive track can create dead zones at frequently used levels. Less often, damaged wiring, a deformed float arm, previous tank work, or a cluster input fault prevents a coherent tank sensor 1 signal. • Moisture, oxidation, or weak terminal tension creates intermittent contact at the tank-top connector. • A pinched or rubbed harness opens as the body moves or the tank changes position. • The float arm catches on internal tank hardware, deposits, or incorrectly routed service parts. • A worn resistive track develops a dead zone where the sender value jumps or freezes. • Previous pump or tank work bends the float arm or leaves the connector incompletely locked. • The sender unit fails internally, or rarely the receiving module input misreads a proven circuit. How Is BMW 009319 Diagnosed with OBDThink? OBDThink is an independent BMW coding and diagnostics app and is not affiliated with BMW AG. Save the complete KOMBI scan, occurrence details, battery voltage, both tank-sender values, and the displayed range before clearing 009319. Compare the channels with the vehicle stationary, after a measured refuel, and during a safe short drive; gradual movement supports the sender, while jumps or a fixed value isolate the suspect path. • 1. Save 009319, occurrence data, battery voltage, both sender values, gauge position, and calculated range. • 2. Verify actual fuel quantity from recent receipts or a controlled measured refuel before interpreting data. • 3. Graph tank sensor 1 and sensor 2 together while the vehicle remains safely stationary. • 4. Compare both values after adding a measured fuel quantity without clearing the stored evidence. • 5. Inspect the accessible tank connector for moisture, loose pins, heat damage, and incomplete locking. • 6. Wiggle only the external harness while watching for abrupt tank sensor 1 signal changes. • 7. Test continuity and sender response using the VIN-specific diagram and approved fuel-system procedure. • 8. After repair, repeat the measured comparison, clear 009319, drive safely, and rescan KOMBI. IF tank sensor 1 stays fixed after a measured refuel while sensor 2 changes, THEN inspect its connector, wiring, float, and track. ELSE IF both values change plausibly but the gauge is wrong, THEN test signal processing and coding by VIN. A smooth sender trend supports normal float travel; sharp vertical steps favor an electrical interruption or a worn spot on the resistive track. How Is BMW 009319 Repaired? Repair the proven break in the tank sensor 1 path. Reseat and clean the accessible connector, restore damaged wiring, correct a trapped float, or replace only the verified sender or integrated delivery unit. Because opening a fuel tank introduces vapor and fire hazards, use approved workshop procedures and replace seals specified for the VIN. • Low cost — secure the loose connector and restore correct terminal contact at the tank flange. • Low cost — repair chafed external wiring and protect its routing from body or seat movement. • Moderate cost — free and correctly position a float obstructed during earlier tank service. • Moderate cost — replace damaged flange seals whenever approved access work opens the fuel tank. • High cost — replace the verified sender or integrated delivery unit when its sweep contains dead zones. • High cost — diagnose KOMBI input hardware only after wiring and sender behavior test correctly. After repair, confirm both sender values respond plausibly to a measured fuel change and verify that 009319 no longer occurs in KOMBI. Can You Drive with BMW 009319? Driving is usually possible when the engine runs normally, no fuel smell or leak exists, and enough fuel is known to be present. However, the gauge and remaining-range estimate cannot be trusted because one chamber value is wrong. Keep the tank well above empty, record distance, and arrange diagnosis before relying on the warning reserve. Stop and switch off the vehicle if fuel odor, visible leakage, wetness near the tank, smoke, or unusual heat appears. Do not probe an opened fuel system with improvised powered equipment. If the gauge shows empty despite a recent fill, avoid assuming the engine has a delivery fault until both sender channels and actual fuel quantity are checked. Stop immediately for fuel odor, leakage, smoke, or tank-area heat; move away and arrange professional recovery. What Questions Are Frequently Asked About BMW 009319? These questions distinguish a sender-path fault from an actual transfer or fuel-delivery problem. Useful evidence includes whether the value changes after refueling, whether bumps trigger a jump, whether one channel stays fixed, and whether both chambers change logically. Store the original readings before moving connectors or opening the tank. • Does 009319 mean the fuel pump is bad? No. It identifies tank sensor 1, although the sender may be integrated with a pump or delivery unit on some models. • Can a full tank still show 009319? Yes. A worn track, stuck float, or open circuit can report an incorrect fixed value regardless of actual fuel quantity. • Will clearing 009319 repair the fuel gauge? No. The code returns when KOMBI again sees the faulty sender response or implausible relationship. Keep the pre-repair sender graph, connector inspection, measured refuel response, and final KOMBI scan together. That record shows whether 009319 was solved by a terminal repair, harness work, float correction, or sender replacement. Finish only after both level channels move plausibly and the fault no longer occurs through a complete verification cycle.