P1152 1999 Ford F150 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2
Quick Answer
The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1152 1999 Ford F150 indicates Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2.
- Common causes
- Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1152 1999 Ford F150 Description
• The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function.
• Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage.
• A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by
measuring the current going through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.
What are the Possible Causes of the DTC P1152 1999 Ford F150?
- Faulty Upstream Oxygen Sensor Bank 2
- Fuel pressure high or low
- MAF sensor dirty/defective
- Vacuum leak on engine
- Leaking fuel injector or fuel pressure regulator
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1152 1999 Ford F150?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1152 1999 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1152 1999 Ford F150 Code
1. What does OBDII code P1152 mean on a 1999 Ford F150?
P1152 indicates that the upstream heated oxygen sensor on Bank 2 is not switching properly and is detecting a rich fuel condition.
2. What are the symptoms of P1152 on a 1999 Ford F150?
Symptoms may include poor fuel economy, rough idling, reduced engine performance, a strong fuel smell from the exhaust, and an illuminated check engine light.
3. What causes the P1152 code to appear?
Common causes include a faulty oxygen sensor, wiring issues, a vacuum leak, a malfunctioning fuel injector, or excessive fuel pressure.
4. How do I know which side of the engine is Bank 2 on a 1999 Ford F150?
Bank 2 refers to the side of the engine that does not include cylinder 1. On a 1999 Ford F150, it is typically the passenger side.
5. Can a dirty mass air flow (MAF) sensor trigger a P1152 code?
Yes, a dirty or failing MAF sensor can cause improper air-fuel mixture readings, leading to a rich condition and triggering the P1152 code.
6. How can I fix a P1152 code on a 1999 Ford F150?
Repairs may include replacing the Bank 2 upstream oxygen sensor, checking and repairing wiring or connectors, fixing fuel injector issues, or addressing vacuum leaks.
7. Is it safe to drive with a P1152 code on a 1999 Ford F150?
While the vehicle may still be drivable, ignoring this code can lead to decreased fuel efficiency, potential engine damage, and higher emissions.
8. How can I test the oxygen sensor for a P1152 code?
You can use a multimeter or an OBDII scanner to check the sensor's voltage and switching frequency. If it’s not functioning properly, it may need replacement.
9. Can a clogged fuel injector cause the P1152 code?
Yes, if the injector is allowing too much fuel into the cylinder, it can create a rich condition and trigger the P1152 code.
10. What tools are needed to diagnose and fix a P1152 code?
Common tools include an OBDII scanner, multimeter, wrench set, and possibly a fuel pressure gauge, depending on the root cause of the issue.
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