P2238 on Toyota
O2 Sensor Positive Current Control Circuit Low (Bank 1 Sensor 1)
P2238 on Toyota vehicles indicates o2 sensor positive current control circuit low (bank 1 sensor 1). Au7o has documented this code across 1 Toyota model — most commonly on Camry. Generic code. The PCM detects a low-voltage condition in the positive current control (pumping current) circuit of the upstream wide-band A/F sensor on Bank 1, typically a short to ground or shorted heater/sensor element pulling the control circuit low. Typical repair costs on Toyota range from $150 to $350, depending on the specific model and root cause.
Common Causes of P2238
- •Positive-current control wire shorted to ground
- •Internally shorted A/F (O2) sensor
- •Damaged wiring/connector
- •Corrosion creating a low-resistance path
- •Failed PCM driver
P2238 on Toyota by Model
Toyota Camry(1 issue)
- Upstream Air/Fuel Ratio (A/F) Sensor Failure — Heater Circuit Fault and Lean/Rich Codes2007-2017
Toyota's upstream wide-band Air/Fuel Ratio (A/F) sensor (Bank 1, Sensor 1, mounted before the catalytic converter — Toyota's name for the front O2 sensor) is a well-known wear item on the Camry. The internal heater element or sensing cell degrades, setting heater-circuit and lean/rich codes, illuminating the check engine light, and causing rough idle, hesitation, and reduced fuel economy. It is a frequent FAIL item at emissions testing.
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What does P2238 mean on Toyota?▼
P2238 stands for "O2 Sensor Positive Current Control Circuit Low (Bank 1 Sensor 1)." Generic code. The PCM detects a low-voltage condition in the positive current control (pumping current) circuit of the upstream wide-band A/F sensor on Bank 1, typically a short to ground or shorted heater/sensor element pulling the control circuit low. On Toyota specifically, this code is documented across 1 model.
What causes P2238 on Toyota vehicles?▼
Common causes on Toyota: Positive-current control wire shorted to ground, Internally shorted A/F (O2) sensor, Damaged wiring/connector, Corrosion creating a low-resistance path, Failed PCM driver. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2238 on a Toyota?▼
Repair costs on Toyota range from $150 to $350, depending on the specific model and root cause.
Which Toyota models have P2238 documented?▼
Au7o has documented P2238 on 1 Toyota model: Camry.