OBD-II Code
P1152
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$40–$1,600
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1152 is the Bank 2 Sensor 1 mirror of P1132 — driver-side upstream O2 reading persistently rich without enough switching activity.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1152 is the Bank 2 Sensor 1 mirror of P1132 — driver-side upstream O2 reading persistently rich without enough switching activity.
P1152 is the Bank 2 Sensor 1 mirror of P1132 — driver-side upstream O2 reading persistently rich without enough switching activity. As with P1132, the rich variant is much rarer than the lean variant on Ford Modular engines.
Cheapest-first ladder
- confirm LTFT Bank 2 at negative-10 percent or worse to rule out a stuck-rich sensor reading; spec is plus or minus 8 percent at idle.
- Pull the Bank 2 upstream connector and inspect for oil contamination from a leaking driver-side valve cover gasket — oil on the sensor element makes it read falsely rich.
- Check fuel pressure at the rail Schrader — 35 to 45 psi spec on 2V Modulars, 55 to 65 psi on 3V returnless; over-spec pressure floods both banks but Bank 2 may set first if a single injector on the driver bank is leaking.
- Pull injectors 5 through 8 (driver bank on most Modulars) and bench-test pop pressure and spray pattern.
- The expensive misdiagnosis is replacing the driver-bank cat or the O2 sensor when the actual fault is a $40 leaking injector or a $35 fuel pressure regulator.
Vehicle-specific patterns1999-2003 Ford F-150 5.4L 2V trucks suffer fuel pressure regulator failure dumping fuel into the upper intake — pull the regulator vacuum reference h…
- 1999-2003Ford F-150 5.4L 2V trucks suffer fuel pressure regulator failure dumping fuel into the upper intake — pull the regulator vacuum reference hose, smell for gas.
- 2001-2004Ford Mustang GT 4.6L 2V cars with high mileage develop sticky injectors from sitting; Lucas or Techron through the rail at 90 psi cleans most of them.
- 2005-2010Ford Expedition 5.4L 3V suffers driver-side VCT phaser failure that holds the cam advanced and skews the Bank 2 fuel trim rich — TSB 14-0194 covers the phaser replacement.
- 2003-2007Ford E-Series 5.4L 2V vans suffer crank-position-induced rich misfire on the driver bank when the timing chain tensioner wears.
Estimated repair$40 to $1,600.
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