98 Frontier 2wd, 5spd "service engine soon" lit up on dash, 120K on vehicle, scanned at Autozone, P1148 came up, reviewed Haynes manual, OBDII list "closed loop control fault (right bank)". Only service item of recent - changed plugs less than 1000 miles ago; recommended Bosch platinum 2 prong and DID NOT gap as listed. Could not find enough specifics to make educated repair decision. Appreciate any advice.

thx

98 Frontier 2wd, 5spd "service engine soon" lit up on dash, 120K on vehicle, scanned at Autozone, P1148 came up, reviewed Haynes manual, OBDII list "closed loop control fault (right bank)". Only service item of recent - changed plugs less than 1000 miles ago; recommended Bosch platinum 2 prong and DID NOT gap as listed. Could not find enough specifics to make educated repair decision. Appreciate any advice.

thx

Pitch the bosch plugs in the trash can and install the NKG plugs the good book calls for.
Any other codes?
Check all O2 sensor operations.
May be a bad 02 sensor or wiring not letting it go into closed loop.
MT

No other codes listed, thanks for the advice. Assume your reply is based on past experience?

No other codes listed, thanks for the advice. Assume your reply is based on past experience?


About 45 years.
Somthing is holding it back from going into closed loop.
You need to get it on a good engine capable scanner.
Check 02 sensors and tempt sensors and other stuff.
And pitch the bosch plugs.
Good luck
MT