CODES P0134, P0300, P0301, P0304

2003 Honda CRV

Engine Performance problem
2003 Honda CRV 4 cyl All Wheel Drive Automatic 82000 miles

Any ideas on what's up with my engine? At first the only code was P0301. When the vehicle is on an incline, with the front higher than the rear, and the engine is cool, it will run kinda rough as if almost shutting off.

The code originally was a cylinder 1 misfire.

After two days the code went to cylinder 1 misfire, cylinder 4 misfire, random misfire, and O2( the chilton book says fuel/air ratio) sensor no activity.

My mechanic originally said the #1 coil pack was bad but now I don't know. Please help me!
September 10, 2008.

Hi rayminater,

Thank you for the donation.

The misfirings are all related and I would suspect the cause to be the O2 sensor.
A diganostic test is recommended to check the O2 sensor readings when in operation.

Check for vacumn leakages first.

Sep 10, 2008.