P2240Fuel & Air Metering

O2 Sensor Positive Current Control Circuit Open Bank 2 Sensor 1

P2240 means the ECM detected an open in the positive current control circuit of the air-fuel ratio sensor on Bank 2 Sensor 1. Usually a failed sensor or wiring fault.

🚗 Yes, short-term, but expect an emissions test failure.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Failed air-fuel ratio sensor$80-$350

50%

The wideband sensor's pump cell circuit fails open.

#2Open in wiring$50-$300

30%

A break in the current control circuit.

#3Connector corrosion$50-$200

15%

Poor contact opens the circuit.

#4ECM fault$300-$1000

Rarely, the module driver fails.

🩺 Common Symptoms

Check engine light
Failed emissions test
Rough running
Poor fuel economy

💰 Repair Cost: DIY vs Shop

DIY Cost

$80-$350

Shop Cost

$200-$500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2240

1Inspect the Bank 2 air-fuel sensor connector and wiring

2Check for opens in the current control circuit

3Review sensor live data

4Replace the air-fuel ratio sensor if confirmed

❓ Frequently Asked Questions

Can I drive with P2240?

Short-term yes, but it affects fuel control and emissions.

How much to fix P2240?

Usually $200-$500 at a shop.

What causes P2240 most often?

A failed air-fuel ratio sensor or an open circuit.

🔗 Related Codes

P2241P2242P2254P2237P0151