Rich fuel mixture on Bank 2 from leaking or stuck-open fuel injectors; Engine misfire on Bank 2 sending unburned fuel into the converter; Retarded ignition timing or incorrect camshaft timing on Bank 2; Faulty Bank 2 exhaust gas temperature sensor reporting falsely high readings; Restricted exhaust flow or a partially clogged Bank 2 catalytic converter; Cooling system or engine overheating conditions that raise exhaust temperatures; Aging or contaminated Bank 2 catalytic converter that no longer manages heat properly

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P200F

P200FCatalyst System Over Temperature (Bank 2)

Q: What does code P200F mean?

Catalyst System Over Temperature (Bank 2). P200F means the powertrain control module has calculated that the Bank 2 catalytic converter has exceeded its safe operating temperature, based on exhaust temperature sensor readings and operating conditions. The computer is protecting the converter from heat damage rather than reporting a failed sensor or a simple efficiency problem.

P200F means the powertrain control module has calculated that the Bank 2 catalytic converter has exceeded its safe operating temperature, based on exhaust temperature sensor readings and operating conditions. The computer is protecting the converter from heat damage rather than reporting a failed sensor or a simple efficiency problem.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Reduced engine power or limp-home mode when the converter temperature is very high
A hot, acrid or sulfur-like smell from the exhaust after driving
Rough running or misfiring that accompanies the over-temperature condition
Poor fuel economy or hesitation under load
In severe cases, glowing or discolored exhaust components near the Bank 2 converter

Common causes, most likely first

Rich fuel mixture on Bank 2 from leaking or stuck-open fuel injectors
Engine misfire on Bank 2 sending unburned fuel into the converter
Retarded ignition timing or incorrect camshaft timing on Bank 2
Faulty Bank 2 exhaust gas temperature sensor reporting falsely high readings
Restricted exhaust flow or a partially clogged Bank 2 catalytic converter
Cooling system or engine overheating conditions that raise exhaust temperatures
Aging or contaminated Bank 2 catalytic converter that no longer manages heat properly

How to diagnose and fix it

Scan all modules and record freeze-frame data for P200F, then check for misfire, fuel trim and oxygen sensor codes on Bank 2
Inspect Bank 2 exhaust gas temperature sensor wiring and compare its live reading against expected values after a cold start
Check Bank 2 fuel trims and injector operation for a rich condition or leaking injector
Perform a cylinder balance or misfire counter test on Bank 2 to rule out ignition and compression faults
Verify ignition timing and camshaft timing are within specification
Measure exhaust backpressure on Bank 2 to detect a restricted converter or exhaust system
Repair the root cause, clear codes and confirm the converter temperature stays within range during a road test

Over-temperature codes are rarely the converter's fault

A P200F is usually a symptom of unburned fuel reaching the converter, so replacing the catalytic converter first often leaves the real misfire or rich condition untouched.
A lazy or skewed Bank 2 exhaust gas temperature sensor can report an over-temperature condition that does not exist, so compare its cold-start reading with ambient temperature before condemning the converter.
Exhaust restrictions downstream of the converter raise backpressure and heat, and a simple backpressure gauge test catches this before any parts are ordered.
Long-term rich fuel trims on Bank 2 that stay within the threshold for a P0172 can still be hot enough to set P200F without ever storing a mixture code.
Repeated over-temperature events can melt or crack the converter substrate, so the repair must address the heat source rather than only clearing the code.

Can I keep driving with P200F?

Limit driving to short trips at light load and avoid sustained high-speed or uphill driving until the cause is repaired, because continued over-temperature operation can destroy the Bank 2 catalytic converter and create a fire risk near the exhaust.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.