What Does P2242 Mean?
The PCM detected excessive current in the positive control circuit for Bank 2 Sensor 1 oxygen sensor heater. This indicates abnormally high current flow that could damage the sensor or PCM.
Common Causes
40%
Shorted oxygen sensor heater element to ground
30%
Shorted wiring in O2 sensor heater circuit to ground or power
15%
Water intrusion or contamination in O2 sensor connector causing short
10%
Failed PCM driver circuit stuck on or shorted
5%
Incorrect O2 sensor installed with wrong resistance specification
Diagnostic Steps
1
Step 1: Disconnect Bank 2 Sensor 1 O2 sensor and clear code; if code returns, wiring or PCM is shorted
2
Step 2: Inspect wiring harness for damage, melting, or contact with hot exhaust components
3
Step 3: Measure O2 sensor heater resistance with sensor disconnected (abnormally low indicates short)
4
Step 4: Check for voltage on heater circuit with sensor disconnected and ignition on (should have battery voltage initially)
5
Step 5: If wiring and sensor test normal, suspect PCM driver circuit failure
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM detected excessive current in the positive control circuit for Bank 2 Sensor 1 oxygen sensor heater. This indicates abnormally high current flow that could damage the sensor or PCM.
The most common cause of P2242 (O2 Sensor Positive Current Control Circuit High Bank 2 Sensor 1) is: Shorted oxygen sensor heater element to ground
Typical repair costs for P2242 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but should be repaired soon to prevent potential damage to PCM or wiring. May cause fuse to blow repeatedly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2242 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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