Code
P200F
Generic
P — Powertrain
Catalyst System Over Temperature Bank 2
Views:
UK: 19
EN: 32
RU: 22
AI status
Completed
Completed
100%
Causes
- Severe or repeated misfire on Bank 2 causing unburned fuel to ignite in the catalyst
- Rich fuel condition on Bank 2 (high fuel pressure, leaking/stuck injectors)
- Restricted or damaged catalytic converter (internal degradation, melting, blockage)
- Faulty or contaminated catalyst temperature sensor (if equipped) or sensor wiring/connector fault
- Exhaust restriction or collapsed pipe causing heat buildup
- Excessive boost or fueling (turbocharger issue) causing high exhaust temps
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Reduced engine power or limp-home mode
- Strong exhaust odor (sulfur or gasoline) or visible smoke in severe cases
- Poor fuel economy
- Possible rattling from a broken/deteriorated catalytic substrate
- Intermittent or constant misfire codes for Bank 2 (P0304, P0305, etc.)
What to check
- Read and record freeze frame data and all stored/ pending codes
- Check for related codes: misfire codes (P030x), oxygen sensor or heater faults, fuel trim or fuel pressure codes
- Visually inspect exhaust system, catalytic converter, heat shields and mounts for damage or discoloration
- Inspect catalyst temperature sensor(s) and upstream/downstream O2 sensors on Bank 2 for damage and secure connectors
- Check wiring harness continuity and resistance for catalyst temp sensor and related sensors
- Monitor live data: catalyst temp (if available), upstream/downstream O2 sensors, short/long term fuel trims, misfire counts, fuel rail pressure, and intake boost
Signal parameters
- Catalyst temperature sensor (Bank 2 upstream and/or downstream) — typical operating range 200–900 °C depending on load; fault triggers when exceeding manufacturer threshold
- Upstream O2 sensor voltage and switching frequency for Bank 2
- Downstream O2 sensor response (should be steadier if catalyst working)
- Short-term and long-term fuel trim (%)
- Misfire counters for individual cylinders on Bank 2
- Fuel rail/line pressure (bar or psi)
Diagnostic algorithm
- Connect a professional scan tool, record freeze frame and live data, and note any accompanying fault codes.
- Inspect catalytic converter(s) and exhaust for visible damage, discoloration, or melted substrate on Bank 2. Also inspect heat shields and nearby components for heat damage.
- Check for concurrent misfire codes on Bank 2. If present, diagnose misfires first: verify spark (coil and plug), fuel injector operation, and cylinder compression.
- Inspect and test fuel injectors on Bank 2 for leaks or stuck-open condition (leakdown test, resistance, injector balance). Verify fuel rail pressure under load.
- Test catalyst temperature sensor(s): check connector, inspect wiring for shorts/opens, measure sensor voltage/resistance per manufacturer spec, compare Bank 1 vs Bank 2 readings.
- Monitor upstream and downstream O2 sensors while driving: compare switching behavior and temperatures. If downstream sensor shows high temp with little change, suspect converter overheating or degradation.
- Measure exhaust backpressure to detect restriction or internal collapse of converter.
- If sensor and wiring check OK and misfires/fueling are ruled out, remove and inspect the catalytic converter on Bank 2. Replace converter if internal damage or obstruction is confirmed.
- After repairs, clear codes, perform a controlled road test to verify normal catalyst temperatures, and recheck for stored codes and fuel trim/misfire status.
Likely causes
- Ongoing misfire(s) on cylinders of Bank 2 (ignition coil, spark plug, injector problem)
- Leaking or stuck injector on Bank 2 causing rich local mixture
- Failed catalyst or internal melt/deterioration on Bank 2
- Faulty catalyst temperature sensor or open/shorted wiring
- Exhaust leak upstream of sensor giving false readings (less likely for over-temp but possible)
Fault status
Status
PCM detected catalyst temperature above threshold for Bank 2 and set code P200F. MIL illuminated. Related misfire or sensor faults may also be present.
Repair difficulty: Medium
Diagnostic time: 1.0-4.0 hours
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