Just bought a 2005 civic hybrid cheap from a coworker that had parked it due to a dead hybrid battery. It has 144,00 miles, so it seemed like an accurate assessment. He had attempted to refurbish himself with no success. I looked into my options and settled on buying from best hybrid batteries at $1500. The battery was here within days and installed easily. Upon starting the car the IMA light was off, the gauges indicated a good charge, and the battery seemed to be operating properly. The only problem is that the check engine light is still on. I went to the local autozone to have the codes read. Most were stated to be dealer only reads, but the one that did provide a description was IMA failure. Since I live an area with emissions testing I need to get this sorted out in order to register my car. Has anyone else had this problem, and if so, what was the outcome?

The actual codes were: 61-1, P1554, 1556, 1558, 1569, 1575, and 1609. I had him clear the codes and have not seen them in the next few miles of driving. I’m not sure if these may have just been old codes that were still present as I did not have the codes cleared immediately after replacing the battery. I’m used to working on OBD I cars where the code disappears upon start up after you repair the issue. Do I need to complete a drive cycle to reset any ready monitors in order for it to pass emissions?

Well. Surprisingly the CEL flashed and went off this morning so I took it by emissions. It failed on ready monitors for the cat and the O2 sensor. Luckily it’s only $9 and I get a free retest so I’ll go back after a few more drive cycles.

It’s no big deal. I’m just glad that neither of those components were in prior codes. So when I complete the drive cycles the car should be good to go. Since my drive to work is almost identical to the drive cycles I’ve found for this car I should have completed plenty within a week and pass when I take it back on my next day off, next Wednesday. Thank you for all the help. I’m pretty far behind on technology and hate working on any car built since 1995.