On a Volkswagen Tiguan, P0304 means the engine control system has detected a misfire in cylinder 4. The code identifies the cylinder in which the misfire was detected; it does not, by itself, identify a failed spark plug, ignition coil, injector or other component. The cause must be diagnosed on the individual vehicle.
What P0304 means on a Volkswagen Tiguan
A misfire means cylinder 4 is not contributing normally to engine operation. The P0304 code definition is “cylinder 4 misfire detected”. It is a diagnostic finding, not a parts-replacement instruction, and the code alone cannot confirm why the cylinder is misfiring.
P0304 refers to cylinder number 4, but the available research does not establish its physical position in the engine bay for every Tiguan engine. Cylinder numbering and component locations depend on the exact engine. Check the service information for your vehicle’s engine, or ask a qualified technician, rather than relying on a generic location diagram.
Symptoms and possible causes of a Tiguan misfire
A cylinder misfire may be accompanied by a rough idle, poor acceleration, unusual engine noises, reduced fuel economy or stalling. A driver may notice one or several of these symptoms, but they do not identify the failed component on their own.
Possible areas for diagnosis include the ignition and fuel systems. Fuel-system possibilities identified in the supplied code reference include a dirty fuel filter, a clogged cylinder 4 injector, a faulty fuel pump or a fuel-rail issue. Ignition components may also need checking where applicable. These are diagnostic avenues to investigate, not a ranking of common Tiguan faults or a confirmed diagnosis for your vehicle. For a broader explanation, read our guide to what can cause a cylinder to misfire.
Other stored codes and test results may help narrow the problem. A technician may need to assess the symptoms and carry out suitable engine-specific tests before deciding which component, if any, has failed.
Does the meaning change on a 2010 or 2022 Tiguan?
2010 Tiguan: P0304 still has the general meaning of a misfire detected in cylinder 4. However, the available information does not establish the engine fitted to every 2010 Tiguan, its component layout or a model-year-specific repair procedure.
2022 Tiguan: P0304 likewise means that a cylinder 4 misfire has been detected. The code definition does not prove that a 2022 model shares the same engine, components, likely cause or repair method as an earlier Tiguan.
For either model year, engine and market specification matter when locating components and selecting a diagnostic procedure. Use service information for the exact vehicle or consult a qualified technician.
How P0304 should be diagnosed and repaired
The repair depends on what testing finds. A diagnostic-first approach is to record all stored codes, note when the symptoms occur, and have the relevant ignition and fuel-system possibilities assessed using appropriate information and tests for the Tiguan’s exact engine. Replacing parts on the basis of P0304 alone can result in unnecessary work.
A supplied Tiguan repair-question page describes an individual 2012 TSI case involving multiple codes and components including spark plugs, a coil, injectors and the PCV system. The available excerpt does not establish which repair, if any, resolved that case. It is not proof of a recurring fault or a confirmed cause for another Tiguan. If a plug or coil has been replaced or swapped and P0304 remains, that result does not identify the underlying problem; further diagnosis is needed. See the Tiguan repair-question example for the limited details available.
Arrange qualified diagnosis if the code returns, the Tiguan runs poorly, or testing requires equipment or expertise you do not have. Do not treat a generic online procedure as a substitute for the correct service information for your engine.
A 2013 Tiguan misfire: what the available evidence can tell you
For a 2013 Tiguan displaying P0304, the supported general interpretation remains a misfire detected in cylinder 4. The available case material concerns an individual 2012 TSI vehicle; it does not establish a recurring 2013 defect or confirm the cause of a different vehicle’s misfire. Diagnosis should be based on the 2013 vehicle’s exact engine, other stored codes and symptoms.
What if the Tiguan has a 2.0 TDI?
The supplied general P0304 reference defines the code as a cylinder 4 misfire, but the available research does not provide TDI-specific causes or repair procedures. Do not assume that petrol-engine spark-plug or ignition-coil advice applies to a diesel. The exact engine and fault information matter, so use suitable diesel-specific service information or seek diagnosis from a qualified technician.
Is it bad to drive with P0304?
Do not ignore the code. The supplied code reference recommends prompt attention and warns that an unresolved misfire can worsen fuel economy and emissions and may increase the risk of costly component damage. The available evidence does not establish a safe driving distance or prove that a particular Tiguan is safe to drive.
If the vehicle is stalling, running very roughly, losing power or behaving abnormally, stop in a safe place and seek assistance rather than continuing the journey. This is a precaution, not a diagnosis. Arrange a professional assessment promptly. If the check-engine light is flashing, see our guide on what to do when the check-engine light flashes.
How much can it cost to fix P0304?
The cost cannot be determined from P0304 alone. The code identifies a misfire in cylinder 4, not the failed part, and the available research contains no repair prices, diagnostic fees, labour times or regional estimates. The required work can vary considerably according to what diagnosis confirms, so it would be misleading to describe every P0304 repair as either cheap or expensive.
Ask for an itemised estimate before authorising work. It should identify the confirmed fault, proposed parts and labour, and any diagnostic charges. Prompt assessment matters because an unresolved misfire may increase the risk of further component damage, but that warning does not mean an expensive failure has already occurred. For broader context, see our general guide to P0304 causes and repair costs.