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Fuel Trim System Rich
Fuel Trim System Rich. That ifr table difference is enough to max out the fuel trims rich. Connect an obd ii generic scan tool, preferably with recording capabilities.

If the air/fuel ratio is less than 14.7 to one (say 12 to 1), the fuel mixture is rich. There are three main parts to the defintion of p2099. System too rich (bank 2) by the time ltft gets to 25%, there will be other codes, too.
The Fault Codes Logged Were As Before:
An indication the pcm is subtracting fuel. To learn about the difference between the upstream and downstream oxygen sensors, read our explanation here. If the air/fuel ratio is less than 14.7 to one (say 12 to 1), the fuel mixture is rich.
Engine Fuel Trim Diagnosis And O2 Sensor Performance.
The ecm/pcm and the o2 sensor are all about keeping things balanced in the combustion chamber. There are a lot of unnecessary and incorrect changes to the tune. A p2099 code means the bank 2 downstream o2 sensor has detected a rich exhaust condition.
A Useful Diagnostic Tool Is To Determine If The Fuel Trim Problem Exists In More Than One Engine Operating Range.
View profile view forum posts private message tuner join date feb 2008 location south west wa. System too rich (bank 1) p0173: Fuel trim is usually displayed as a percentage reading on a scan tool.
Fuel Trim Should Be Checked At Idle, At 1,500 Rpm And At 2,500 Rpm.
For lowest emissions, the engine computer tries to keep the fuel mixture balanced around 14.7 to 1 (14.7 parts of air to one part fuel). If the number is high, that means the engine is running rich. Diagnostic trouble code (dtc) p2097 stands for post catalyst fuel trim system too rich bank 1.
It Is Triggered When The Downstream Bank 1 Oxygen Sensor Registers A Rich Condition.
Post catalyst fuel trim system. Post catalyst means whatever is happening is after the catalytic converter (in terms of exhaust flow). A/f is expressed as either a ratio (14.7:1 for example) or as a lambda value.
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