Is it safe to drive with a P0155 code?

Severity is low. Address P0155 sooner rather than later — driving with an active check engine light can worsen the problem or void emissions warranties.

How much does it cost to fix P0155?

Repair costs for P0155 typically range from $40 to $300 in the US, depending on the underlying cause. The most common fix is: Failed heater element.

What are the symptoms of P0155?

CEL. Slower closed-loop entry on cold start.

Check Engine Code

P0155

O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1)

Severity: low DIY difficulty: 2/5 Typical cost: $40–$300

What P0155 means

Bank 2 twin of P0135. Heater circuit fault.

Symptoms

CEL
Slower closed-loop entry on cold start

Likely causes (most common first)

Failed heater element
Blown fuse
Damaged wiring

Can I keep driving?

Low — mostly emissions/economy

Typical repair cost

DIY fixes can start near $40 (parts only). Shop repairs for P0155 typically run up to $300 depending on the underlying cause and vehicle. Start with the most common cause — Failed heater element — before throwing parts at it.

Related codes

P0135 P0141 P0161

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