C0121 Nissan Aa-x OBD Code

OBD/2 C0121 error code description and symptoms.

Vehicle Speed Sensor (VSS) Intermittent Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). This DTC is set the same way as C0121. However, it is intended to flash the transmission control indicator lamp (TCIL) for first time VSS circuit error/malfunctions. Refer to possible causes for C0121

Gear changes are accomplished by a command from the TCM to energize the clutch actuator to release the clutch; after which various actuators inside the transmission disengage the current gear, and depending on current operating conditions, engage the next higher or lower gear ratio. All of this happens much faster than a human driver could change gears, and in most applications, gear changes are as smooth and seamless as on any fully automatic transmission.

C0121 Nissan Aa-x Error Code Repair Process :

The rule of C0121 code when it comes to emissions-related vehicle repair is that any modification that changes the vehicle from a certified configuration to a non-certified configuration is considered tampering: this applies to both vehicle owners and repair facilities and is, therefore, a Federal offense. Replacing a catalyst with a straight pipe is one traditional example of lamp anti-theft indicator circuit open. Likewise, overriding the OBD C0121 error in system through the use of high-tech defeat devices or non-certified computer chips, for example, would also be considered tampering. The OBD system may, however, be repaired back to its original certified configuration with certified performance chips or appropriate aftermarket parts.

Common Causes of Nissan Aa-x C0121 OBD2 Code

A common cause of code C0121 is the failure of Lamp Anti-Theft Indicator Circuit Open, but there are several other possible causes as well, such as ;

EVAP system hose leaking
Engine Control Module (ECM)
Intake air leaks
Fuel injectors may be faulty

C0121 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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C0121 Nissan Aa-x OBD Code

C0121 Nissan Aa-x Error Code Repair Process :

Common Causes of Nissan Aa-x C0121 OBD2 Code

C0121 code for other Nissan cars