What Does P1097 Mean?
After a deceleration fuel cutoff event, the Bank 1 upstream oxygen sensor is not responding quickly enough to the oxygen-rich exhaust. This indicates sensor aging or contamination affecting its ability to detect rapid changes in exhaust gas composition.
Common Causes
55%
Aged oxygen sensor with slow response time
20%
Contaminated sensor element from deposits
15%
Exhaust leak affecting sensor readings
7%
Weak sensor heater circuit
3%
Fuel system issues causing rich condition
Diagnostic Steps
1
Step 1: Monitor sensor voltage during deceleration fuel cutoff events using graphing function
2
Step 2: Test sensor heater circuit for proper resistance and voltage
3
Step 3: Check for exhaust leaks that could affect sensor readings
4
Step 4: Perform fuel trim analysis to verify fuel system is operating correctly
5
Step 5: Replace oxygen sensor if recovery time from lean condition is excessive
Estimated Repair Cost
$150 - $350
Parts + labor, varies by vehicle and location
After a deceleration fuel cutoff event, the Bank 1 upstream oxygen sensor is not responding quickly enough to the oxygen-rich exhaust. This indicates sensor aging or contamination affecting its ability to detect rapid changes in exhaust gas composition.
The most common cause of P1097 (O2 Sensor Circuit Slow Response after Coast Down Fuel Cutoff (Bank 1 Sensor 1)) is: Aged oxygen sensor with slow response time
Typical repair costs for P1097 range from $150 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive with minor impact on drivability. May notice slight hesitation during acceleration after coasting. Fuel economy will be reduced.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1097 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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