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GM Tech (Cam)
GM Tech (Cam), Pontiac Technician
Category: Pontiac
Satisfied Customers: 2373
Experience:  GM Grand Master Technician 2007. 14 years experience.
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When i have codes 1621, and 420 pontiac gran am 2.4,

Customer Question

When i have codes 1621 , and 420 pontiac gran am 2.4, 1998,should I install the computer first?
Submitted: 11 months ago.
Category: Pontiac
Expert:  john aka eaut replied 11 months ago.

has the converter been checked for meltdown or restrictions? has a back pressure gauge been used? have you reset the codes and drive cycled? if so did they both return?

Customer: replied 11 months ago.

No, no reply needed

Expert:  john aka eaut replied 11 months ago.

think a phone chat would benefit you.. Considering im a master auto technician..It will help clear up your confusion..and 5 dollars is justanswers minimum fee

Customer: replied 11 months ago.

I think I can do o.k with out a call

Expert:  john aka eaut replied 11 months ago.

so have you ever reset the light? have you had the converter tested?

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