Check Engine Light Strangely Come On (r34)

[RXXXIV]

Hi all,

So a few weeks back I got a major defect on my ER34 25GT Series 1 NA and therefore had to get a roadworthy. My HKS exhaust wouldn't pass, so i purchased a Series 2 Turbo Stock Catback system with Muffler. After I swapped them back over, after driving for 5 minutes or so the Check engine light now comes on. If i drove the car hard it would stay off but if i drove it normally it would always come on. Now its coming on as soon as the car starts up.

I should also mention I have smashed out the inside of the cat so im assuming thats what might be causing it? Although, the sensor for the exhaust is closer to the engine i think?

Someone told me i should disconnect the battery for 12 hours as that resets the ECU which will then allow it to re learn everything.

Basically I'm just asking for help getting the light off?

Any ideas or comments would be great
Thanks,

Justin

[Stixbnr32]

Forget about it.

[Kinks]

I should also mention I have smashed out the inside of the cat so im assuming thats what might be causing it? Although, the sensor for the exhaust is closer to the engine i think?

not real smart to talk about that after getting defected. Cops read forums too you know!

R34s are sensitive and throw codes quite easily. Mine told me about coil packs before it even started missing under load. The R34 doesn't have a cat temp sensor (at least mine doesn't) so that won't be a problem. The only sensor in the exhaust is the O2 sensor, and that may be on its way out. You need to check the fault codes and that will tell you exactly what is wrong. O2 sensor and coil packs are the 2 most common issues.

[nismo_d'luxe]

not real smart to talk about that after getting defected. Cops read forums too you know!

R34s are sensitive and throw codes quite easily. Mine told me about coil packs before it even started missing under load. The R34 doesn't have a cat temp sensor (at least mine doesn't) so that won't be a problem. The only sensor in the exhaust is the O2 sensor, and that may be on its way out. You need to check the fault codes and that will tell you exactly what is wrong. O2 sensor and coil packs are the 2 most common issues.

Yeah my R34 did exactly the same thing. The light came on for about 2 weeks no problems whatsoever, the light went away for a couple more weeks then came back and one of the coil packs had shit the tin intermittently in the process.

[Sinista32]

Obtain the code for a definitive answer.

Likely 02 Sensor - Chck and replace if faulty

Reset your ECU. disconnect the battery and push down on the brake pedal several times and hold it down for a few secs

Others have been known to take globe out. Issue with that is obvious (other faults wont be detected)

Have you or the previous owner replaced the coil packs. Also a common issue with the R34.