Mazda Cx-7 U0121 Engine Error Code

When you check Mazda Cx-7 car engine light came on code U0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Mazda manufacturer may have a different definition for the U0121 OBD-II Diagnostic Network (U) Trouble Code. So you should chech it on our car models.

On 1999 and later U0121 Mazda Cx-7 engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

Mazda Cx-7 U0121 OBD-II Diagnostic Network (U) Trouble Code Description Mazda Cx-7 car U0121 OBD-II Trouble Code Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and comm Reason For Mazda Cx-7 U0121 Code The reason of Mazda Cx-7 U0121 OBD-II Engine Error Code is U0121 Lost Communication With Electronic Brake Control Module.

The rule of U0121 Mazda Cx-7 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 . Likewise, overriding the OBD U0121 Mazda Cx-7 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.

Mazda Cx-7 U0121 Possible Solution :

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

What does fault code U0121 mean for Mazda Cx-7 ? What does a diagnostic reading U0121 mean for Mazda Cx-7 ? How to fix OBD2 Code U0121 for Mazda Cx-7 ? What do we know about U0121 code for Mazda Cx-7 ?