P0432 on 2000-2006 Jeep Wrangler — Main Catalyst Efficiency Below Threshold (Bank 2)
1 vehicles · 1 makes · $600-$1,800 repair
Most Reported On
P0432 is an OBD-II diagnostic trouble code meaning “Main Catalyst Efficiency Below Threshold (Bank 2).” This code means the PCM determined that the catalytic converter on Bank 2 is not reducing emissions as effectively as required, based on comparing the upstream and downstream oxygen sensor readings. It indicates the converter's efficiency has dropped below the federal threshold. The car usually runs fine, but it will fail emissions testing and may signal a deteriorating converter or an upstream issue affecting it. Causes other than the converter (like exhaust leaks or bad sensors) should be ruled out before replacing the converter. This code is most commonly reported on 2000-2006 Jeep Wrangler, with repair costs ranging from $600 to $1,800.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0432, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
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- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0432 mean?
P0432 stands for "Main Catalyst Efficiency Below Threshold (Bank 2)." This code means the PCM determined that the catalytic converter on Bank 2 is not reducing emissions as effectively as required, based on comparing the upstream and downstream oxygen sensor readings. It indicates the converter's efficiency has dropped below the federal threshold. The car usually runs fine, but it will fail emissions testing and may signal a deteriorating converter or an upstream issue affecting it. Causes other than the converter (like exhaust leaks or bad sensors) should be ruled out before replacing the converter.
What are the most common causes of P0432?
The most common causes of P0432 are: Worn or failing catalytic converter (Bank 2), Faulty downstream (or upstream) oxygen sensor, Exhaust leak near the converter or sensors, Engine running rich or misfiring (contaminating the converter), Oil or coolant contamination of the converter, Damaged or aftermarket low-efficiency converter. The specific cause varies by vehicle.
How much does it cost to fix P0432?
Repair costs for P0432 range from $600 to $1,800, depending on the vehicle and root cause.
Which vehicles are affected by P0432?
Au7o has documented P0432 across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.