Ford code
P0420: on a Ford
How much to fix P0420 on a Ford? Typically $430 to $2,325 for catalytic converter replacement, the most common fix. This is an estimate, not a quote.
On a Ford, P0420 means catalyst efficiency on bank 1 is below the limit. That can come from a worn converter, a bad sensor or an exhaust leak. Ford engines vary a lot, so ask which engine you have.
General meaning of P0420: The computer compares the oxygen sensor before the catalytic converter with the one after it. On this code the two readings look too alike, which suggests the converter is not cleaning the exhaust as well as it should on the side with cylinder 1. See the full P0420 page.
Models to know about
| Model | Years | What to know |
|---|---|---|
| F-150 | 2009 to 2020 | Often a bank 1 issue on the V8s. |
| Escape | 2008 to 2019 | Mostly the 2.5 and 3.0; check for exhaust leaks. |
| Fusion | 2010 to 2019 | Often a sensor. |
| Focus | 2012 to 2018 | Direct-injection engines that carbon up. |
Common causes on a Ford
- Rear oxygen sensor that wears out.
- Exhaust leak at the manifold or flex joint, which is common on trucks.
- Misfire history from coils and plugs.
- Converter aging on high-mileage trucks.
NHTSA's public complaint file shows how owners describe this kind of trouble: the 2013 Ford Escape has 2,757 complaints on file, and 290 of them use wording like catalytic, check engine, P0420. Complaints are owner reports, not proof of a cause.
Check this first
- Listen for an exhaust leak when the engine is cold.
- Check if misfire codes were stored earlier.
- Ask for the live waveform of both oxygen sensors.
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $300 | $1,900 |
| Labor: 1.2 to 2.5 hours × $110 to $150 an hour | $132 | $375 |
| Fees: shop supplies, disposal, diagnostics | $0 | $40 |
| Total, rounded | $430 | $2,325 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. In California and New York, parts cost more because those states require a California-certified converter. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
Ford converters on trucks are large and costly. A shop quoting a full replacement should show you test results first.
Other repairs that may be involved
| Repair | Typical range, US |
|---|---|
| Catalytic converter replacement | $430 to $2,325 |
| Oxygen sensor replacement (one sensor) | $100 to $350 |
Questions to ask the shop
- Which bank is it, and how do you know?
- Is the leak ruled out?
- Is the new part CARB-legal?
Got a quote already? Check it against the range. Wondering if a recall touches this problem? See Ford recalls by model or check a VIN.
P0420 on a Ford: questions
Is P0420 different from P0430?
Yes. P0420 is bank 1, the other is bank 2 on V6 and V8 engines.
Does my Ford have a special warranty?
Federal emissions coverage may apply. Ask.
How much does it cost to fix P0420 on a Ford?
The most common fix, catalytic converter replacement, has a typical range of $430 to $2,325 across the US. That is an estimate built from parts prices and local labor wages, not a quote. Your model, engine and shop move it.
P0420 on other makes
Sources
- NHTSA complaints, 2013 Ford F-150
- NHTSA complaints, 2013 Ford Escape
- NHTSA recall lookup by VIN
- US federal emissions defect warranty rules (40 CFR part 85, subpart V)
Written from public NHTSA data, owner-reported patterns and general repair knowledge, in our own words. Model lists are examples, not a full list, and patterns are not a diagnosis. Prices updated October 2026. Not a repair shop, estimates only.