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1998 Ford F-150 MAF Sensor Replacement Causes P1132 and P1152 Codes - Diagnosis Tips

Model: 98 f-150 Fault Code: P1132 Posted: 2015-11-22 14:55

My 1998 Ford F-150 originally showed OBD-II codes P171 and P174, which were diagnosed as related to air flow issues. I replaced the mass air flow (MAF) sensor based on advice from two different repair shops. After replacement, the codes have changed to P1132 and P1152, indicating oxygen sensor-related issues. The truck has otherwise performed well, but fuel efficiency has decreased. I'm now concerned about whether replacing the MAF sensor caused a shift in engine air-fuel ratio readings. I've been advised to check oxygen sensor voltages, fuel trims, and perform a fuel pressure test with a leak-down test at idle (KOEO). Additionally, an exhaust manifold replacement on the passenger side was completed earlier but did not resolve the issue. I'm currently using a Craftsman scan tool and am learning how to conduct live data readings. I plan to monitor oxygen sensor responses and verify if fuel trims are adjusting properly. Any insights into why P1132 and P1152 appear after MAF replacement would be greatly appreciated.

Related fault codes
P1132P1152
Comments (7)
Anonymous 2015-11-22 16:02

Before replacing the MAF sensor, did you perform any diagnostic tests? Use an OBD-II scanner to check oxygen sensor voltages and fuel trim values. Avoid using an oiled air filter—this can interfere with airflow readings. Also, ensure no modifications have been made to the intake system. Consider keeping the original MAF sensor for comparison testing.

Anonymous 2015-11-22 17:12

The truck was diagnosed at two different shops for P171 and P174 codes. The first shop cleaned the MAF and replaced the air filter, then cleared the codes—after 4 to 6 cycles, they returned. A second shop claimed the MAF was adjusting airflow for an elevation of 6,500 feet, but the truck is used at sea level. That shop quoted $500–$600 to replace the sensor. I replaced it myself and cleared codes. After several cycles, the codes now show P1132 and P1152. The truck otherwise runs well except for reduced fuel economy.

Anonymous 2015-11-22 20:13

Note: I didn't mention that a passenger-side exhaust manifold was replaced with new gaskets and a full manifold. No improvement in the OBD-II codes despite this repair.

Anonymous 2015-11-23 09:04

You should examine what the Powertrain Control Module (PCM) is receiving from the oxygen sensors—these readings may be stuck high or rich. Try forcing the system into a lean condition to see if the sensors respond. Fuel trim analysis and fuel pressure leak-down tests can help identify whether there's an underlying issue with air-fuel mixture or vacuum leaks.

Anonymous 2015-11-23 20:55

Thanks for the response. I'm still learning how to use my scan tool—so far, I can only perform basic diagnostics. I plan to do a live O2 sensor reading soon using my Craftsman scanner to get real-time data.

Anonymous 2015-11-26 16:05

I cleared the codes again and drove 200 miles with no return of P1132 or P1152. Could the oxygen sensors be self-correcting over time? Fuel economy has returned to normal.

Anonymous 2015-12-03 22:14

After another 1,000 miles, the codes have not reappeared—this suggests a possible resolution or that the issue is intermittent. Still monitoring for any changes in fuel trim or sensor behavior.