Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONDIAGNOSTIC TROUBLE CODE DESCRIPTIONSENGINE CONTROL SYSTEMWITH - BMW DIAGNOSTIC SYSTEMCODE 201 (EMISSION CONTROL)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Code 201 (Emission Control)
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Code 201 (Emission Control)
EMISSION CONTROL
Explanation
This trouble code is stored when the emission control reaches its control limit and no other defect which effects the mixture has been detected. This may be attributed to deviations in the mixture composition (mixture too rich or too lean for longer than 10 sec).
Possible causes
- Vehicle stops due to lack of fuel (tank empty)
- Incorrect fuel pressure
- Defective or coked injector valves
- Incorrect output value from engine temperature sensor
- Secondary air in intake or exhaust tract
- Defect in tank ventilation
- Poor combustion (ignition, inlet/exhaust valves, compression etc. defective...)
NOTE: Poor engine response will occur since the Digital Motor Electronic (DME) operates with a substitute value.
Troubleshooting
- Measure CO content at exhaust manifold while observing the oxygen sensor voltage.
- Establish operating condition at the time the defect was detected.
- Proceed with displayed scan tool diagnostic instructions where applicable.
Explanation
This trouble code is stored when the emission control reaches its control limit and no other defect which effects the mixture has been detected. This may be attributed to deviations in the mixture composition (mixture too rich or too lean for longer than 10 sec).
Possible causes
- Vehicle stops due to lack of fuel (tank empty)
- Incorrect fuel pressure
- Defective or coked injector valves
- Incorrect output value from engine temperature sensor
- Secondary air in intake or exhaust tract
- Defect in tank ventilation
- Poor combustion (ignition, inlet/exhaust valves, compression etc. defective...)
NOTE: Poor engine response will occur since the Digital Motor Electronic (DME) operates with a substitute value.
Troubleshooting
- Measure CO content at exhaust manifold while observing the oxygen sensor voltage.
- Establish operating condition at the time the defect was detected.
- Proceed with displayed scan tool diagnostic instructions where applicable.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.