System Too Rich Off Idle Bank 2
P2180 indicates that the engine control module (ECM) has detected an excessively rich air-fuel mixture (too much fuel or too little air) on Bank 2 when the engine is off idle (above idle speed). This condition can be caused by a variety of issues including faulty oxygen sensors, fuel injector leaks, high fuel pressure, or a restricted air intake. The ECM monitors the oxygen sensor readings and fuel trim adjustments; when the long-term fuel trim is excessively negative (indicating the ECM is reducing fuel to compensate for a rich condition) on Bank 2, it sets this code.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2, Sensor 1)
- Leaking fuel injector on Bank 2
- High fuel pressure (faulty fuel pressure regulator or pump)
- Restricted air intake (clogged air filter or MAF sensor issue)
- Engine mechanical issue (low compression, worn camshaft)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation off idle
- Strong fuel smell from exhaust
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect air filter and intake for restrictions; clean or replace as needed.
Step 3: Check fuel pressure with a gauge; compare to specifications.
Step 4: Monitor oxygen sensor readings and fuel trim values with a scan tool.
Step 5: Perform a smoke test to check for vacuum leaks.
Step 6: Test fuel injectors for leakage or imbalance (flow test).
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as a rich mixture can damage the catalytic converter and oxygen sensors, leading to more expensive repairs.
How much does it cost to fix?▼
The cost varies depending on the root cause, typically ranging from $150 to $400 for parts and labor, but could be higher if the catalytic converter is damaged.