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This oxygen sensor simulator will allow you to run your Subaru Forester Subaru Forester without catalyst or Diesel Particulate Filter and still keep the service engine soon light off. It supplies the Powertrain Control Module with mimic, fluctuating voltage signal and tricks the Electronic Control Unit thinking the emissions are normal. Heated Subaru Forester Diesel O2 Sensor Simulator is an add-on replacement wired up to the downstream air fuel sensor harness. When the diesel exhaust air fuel sensor delivers the Engine management a signal that is not within the manufacturer's specifications the OBD-II (OnBoard Diagnostic) system logs an error, accordingly service engine soon light will illuminate, resulting in Electronic Control Module safe mode and restricted performance capability at the wheels. The modified diesel engine now produces a larger amount of exhaust gases than allowed. It also allows you to eliminate the (Diesel Particulate Filter) DPF. Information between the two threads is usually different.Magnum Subaru Forester Diesel Oxygen Sensor Simulator is a must-have upgrade if you removed the diesel catalytic converter or even installed a catalyst converter bypass, an aftermarket header, a free flow catback or high-flow cat. This makes it more confusing for others trying to help you deal with problem. When you start a thread for a problem please do not start another one for the same thing. As a guess, the normal resistance for the heater may be about 10 ohms.Īs an added note. You can also check the resistance of the heater coil to see if it is ok. This is usually while the engine is warming up.

By checking the voltage across the heater leads you should see 12 volts there when the heater is supposed to be on. Either the heater in the sensor is bad and you will need to replace the sensor or, there is a bad connection to the heater and you need to repair the circuit wiring to the sensor heater. You cannot short the heater wires together to solve this trouble. Can I fake out the check engine light somehow so I can pass an E-check until I get the sensor replaced? What would happed if I spliced the wires together?Īs the others have stated already the trouble is with the heater circuit to the sensor after the CAT.