Most obdii codes are multi-digit, such as po300,po301,po302, etc. Etc.
Po300's are usally misfire codes pertaining to the same cylinder...code po302 is a misfire in cylinder #2. A po300 code is a random misfire for any cylinder
The firing order for a 4 cylinder 1994 Buick Century is 1, 3, 4, 2. For the 6 cylinder engine the order is 1, 2, 3, 4, 5, 6.
Dextron 3
The firing order for a 2002 Buick Century 2002 is 1, 2, 3, 4, 5, 6. Cylinder number one is at the front left.
1-6-5-4-3-2
21st century's 3 digit code
1-2-3-4-5-6
1-6-5-4-3-2
1-3-4-2
018
on 3100 engine, 11.6 quarts=10.9 liters including reservoir
1-6-5-4-3-2
AnswerThe firing order for a 4-cylinder 2.2L Buick Century is: 1-3-4-2. The distributor rotates in a clockwise direction, with #1 plug wire located at the upper left of the distributorThe firing order on a 3.1 v6 is simple. 1-2-3-4-5-6 See a diagram of the 3.1 and 3.8 here.http://www.2carpros.com/forum/1999-buick-century-spark-plug-firing-order-vt177159.htmlhttp://autorepair.about.com/od/enginefiringorders1/