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Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19452
Experience:  ASE Master Certification. GM World Class Certification
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Chevrolet Cobalt: 2005 chevy cobalt 2.2 codes p0121 p1516 and

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2005 chevy cobalt 2.2 codes p0121 p1516 and p0030 where do i start
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Was the last code a P0300 or P0030?

Customer: replied 4 years ago.


Thanks. XXXXX and P1516 codes show that there are problems in the throttle actuator and throttle position sensor. These are housed in the throttle body. Check the wiring and connections at the throttle body, then replace the throttle body.

The P0121 code shows a problem in the heater circuit of the primary O2 sensor. Check the Emission 1 fuse. If the fuse is okay, the O2 sensor at the manifold will need to be replaced.

Customer: replied 4 years ago.

the car looses power and stalls are these the reason for that, on the digital odomitor it says engin power reduced then says engin power failure and stalls,, just want to try and cover my bases here,

The throttle body and the 121 and 1516 codes are the reason for the reduced power message and the stalling. The O2 sensor problem is secondary and will not cause the engine to run poorly. You will need to check the throttle body wiring and replace the throttle body to fix the issues with the vehicle running poorly.

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