Crank No Start
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4th Gear
Joined: Nov 2022
Posts: 4
Likes: 0
From: New York
Crank No Start
I installed headers and a new exhaust and after two days my car shut off while driving. I found out that the o2 sensors were bad and I switched them out. Even after switching them out the car still doesn't turn on. The only code I got after fixing the o2 sensor issue was a P102 which is MAF low voltage. I am not sure if P102 would cause the car to crank no start or I'm thinking that my battery is dead. Any ideas?
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Joined: Nov 2016
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From: GA
I installed headers and a new exhaust and after two days my car shut off while driving. I found out that the o2 sensors were bad and I switched them out. Even after switching them out the car still doesn't turn on. The only code I got after fixing the o2 sensor issue was a P102 which is MAF low voltage. I am not sure if P102 would cause the car to crank no start or I'm thinking that my battery is dead. Any ideas?
Thread Starter
4th Gear
Joined: Nov 2022
Posts: 4
Likes: 0
From: New York
I just charged it last night back to 100% and I put the battery back and still the same thing. The battery is pretty new only bought it back November last year. Maybe a jump is still necessary.
Rookie
Joined: Mar 2023
Posts: 47
Likes: 16
From: KY
O2 sensors are not going to prevent the car from starting. They only affect the closed and open loop fueling operation. You can actually unplug them and the engine will still start. The battery will also not likely be the problem since the vehicle shut off during operation. While in operation, the alternator should maintain a running voltage over 12V to keep the battery charged for all the components while running. If the vehicle shuts off, that would likely point to a fault with the alternator instead of the battery.
Since you are not familiar with testing the basics, you should take the car to a mechanic for troubleshooting. All fuel injected engines run off the same basic principal so if you actually want to get your hands dirty then Google how to test spark, air, fuel, and compression.
In an effort to maybe save some time and specifically due to having just installed headers, check the crank position sensor. If that sensor was unplugged and not properly re-connected, driving vibrations could have caused the connector plug to disconnect which will cause a no start issue. Also, if the headers were not ceramic coated or exhaust wrapped, they will generate quite a bit of heat. Damage/Shorting can occur if a wire makes contact with the header so maybe also thoroughly check for any contact with the the electrical system. Good luck.
Since you are not familiar with testing the basics, you should take the car to a mechanic for troubleshooting. All fuel injected engines run off the same basic principal so if you actually want to get your hands dirty then Google how to test spark, air, fuel, and compression.
In an effort to maybe save some time and specifically due to having just installed headers, check the crank position sensor. If that sensor was unplugged and not properly re-connected, driving vibrations could have caused the connector plug to disconnect which will cause a no start issue. Also, if the headers were not ceramic coated or exhaust wrapped, they will generate quite a bit of heat. Damage/Shorting can occur if a wire makes contact with the header so maybe also thoroughly check for any contact with the the electrical system. Good luck.
Instructor
Joined: Jan 2023
Posts: 909
Likes: 415
From: TX
A MAF code, or any other sensor code, doesn’t mean the sensor is bad and should be replaced. It means that sensor is returning values out of the acceptable range or no output at all.
Not sure if you did this but, have you tried disconnecting the Battery for 10 mins? Also exactly what O2 sensors did you buy to replace?
1st would be battery, next would be correct replacement sensor and/or MAF. I just don't see how doing exhaust would damage the original 2 sensors? Unless you were careless with them during the install.
1st would be battery, next would be correct replacement sensor and/or MAF. I just don't see how doing exhaust would damage the original 2 sensors? Unless you were careless with them during the install.
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Rookie
Joined: Mar 2023
Posts: 47
Likes: 16
From: KY
Not sure if you did this but, have you tried disconnecting the Battery for 10 mins? Also exactly what O2 sensors did you buy to replace?
1st would be battery, next would be correct replacement sensor and/or MAF. I just don't see how doing exhaust would damage the original 2 sensors? Unless you were careless with them during the install.
1st would be battery, next would be correct replacement sensor and/or MAF. I just don't see how doing exhaust would damage the original 2 sensors? Unless you were careless with them during the install.
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