What Does P1094 Mean?
The upstream oxygen sensor on Bank 2 is responding too slowly when the engine is operating in rich fuel control mode. This indicates the sensor is aging or contaminated and cannot switch voltage quickly enough for proper fuel trim adjustments.
Common Causes
50%
Aged or contaminated oxygen sensor
20%
Exhaust leak near sensor affecting readings
15%
Sensor heater circuit degradation
10%
Wiring resistance or poor connection
5%
Fuel contamination or silicone poisoning
Diagnostic Steps
1
Step 1: Monitor Bank 2 Sensor 1 live data for voltage switching speed and pattern
2
Step 2: Check sensor heater operation and circuit resistance
3
Step 3: Inspect for exhaust leaks upstream of sensor using smoke machine or visual inspection
4
Step 4: Compare response times between Bank 1 and Bank 2 upstream sensors
5
Step 5: Replace oxygen sensor if switching time exceeds manufacturer specifications
Estimated Repair Cost
$150 - $350
Parts + labor, varies by vehicle and location
The upstream oxygen sensor on Bank 2 is responding too slowly when the engine is operating in rich fuel control mode. This indicates the sensor is aging or contaminated and cannot switch voltage quickly enough for proper fuel trim adjustments.
The most common cause of P1094 (O2 Sensor Circuit Slow Response in Rich Control Range (Bank 2 Sensor 1)) is: Aged or contaminated oxygen sensor
Typical repair costs for P1094 range from $150 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but will cause reduced fuel economy and may lead to catalytic converter damage over time if not addressed. May fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1094 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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