Why didn't the engine light go off after replacing the ignition coil?

Question

During the initial diagnostic test, two codes showed up P1320 and P0303. The ignition coil was replaced and code number P0303 went away, so that problem was fixed. The engine light was still on, so another diagnostic test was done and the code P1320 showed up. The engine light is still on. What is wrong with my vehicle. 2000 Infiniti, I30t.

Answer 1

Did you used a factory coil? either the coil you installed is not correct or you may have another bad ignition coil. You could wait until another P030X codes comes back to let you know which other coil is bad or perform a test with an oscilloscope to find it the bad coil.