P0437 — Catalyst Temperature Sensor Range/Performance (Bank 2)
Can drive — fix at your convenience.
What P0437 means
This code means the catalyst temperature sensor on bank 2 is sending readings that fall outside the normal expected range or don't change the way they should. The usual culprits are a faulty sensor, damaged wiring, or a poor electrical connection. Repairs most often involve replacing the temperature sensor and fixing any wiring or connector issues.
Common symptoms
- Check engine light is on
- Failed emissions or smog test
- No noticeable change in how the car drives
- Possible slight drop in fuel economy
- Stored sensor readings that look out of range on a scan tool
Common causes
- Faulty catalyst temperature sensor on bank 2
- Damaged, frayed, or shorted sensor wiring
- Corroded or loose electrical connector
- Exhaust leak affecting sensor readings
- Rarely, an engine control module fault
Typical repair cost
$120 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0437 code?
Yes, almost always. This is a sensor-related code and the car usually drives normally. The main downsides are the check engine light and not passing emissions, so get it checked when convenient rather than ignoring it indefinitely.
How much does it cost to fix a P0437?
Most repairs are on the affordable side, typically $120 to $400. The sensor itself isn't expensive, and labor is usually modest unless wiring repairs are involved.
Is a P0437 code serious?
It's a low-severity code. It rarely affects how the car drives and doesn't pose a safety risk, but it will keep the check engine light on and prevent passing emissions, so it should still be fixed.
Why does P0437 mention range and performance?
It means the temperature sensor's signal is within its electrical limits but doesn't behave realistically, like staying flat or reading outside expected values. That points to a lazy or failing sensor rather than a dead one.